单词在什么时候加in g 在时间前面加介词和不加的区别，e.g.the middle ...
\u5728\u8868\u793a\u65f6\u95f4\u7684\u5355\u8bcd\u524d\u9762\uff0c\u4ec0\u4e48\u65f6\u5019\u8981\u52a0on,\u4ec0\u4e48\u65f6\u5019\u52a0in\u5177\u4f53\u51e0\u70b9\u7528at \u5177\u4f53\u54ea\u5929\u7528on \u5e74\u6708\u7528in \u4f46\u7279\u6307\u7684\u6bd4\u5982 a sunny morning ,Friday morning \u7528on
\u65f6\u95f4\u540d\u8bcd\u524d\u6240\u7528\u4ecb\u8bcd\u7684\u901f\u8bb0\u6b4c
\u5e74\u6708\u5468\u524d\u8981\u7528in\uff0c\u65e5\u5b50\u524d\u9762\u5374\u4e0d\u884c\u3002
\u9047\u5230\u51e0\u53f7\u8981\u7528on\uff0c\u4e0a\u5348\u4e0b\u5348\u53c8\u662fin\u3002
\u8981\u8bf4\u67d0\u65e5\u4e0a\u4e0b\u5348\uff0c\u7528on\u6362in\u624d\u80fd\u884c\u3002
\u5348\u591c\u9ec4\u660f\u987b\u7528at\uff0c\u9ece\u660e\u7528\u5b83\u4e5f\u4e0d\u9519\u3002
at\u4e5f\u7528\u5728\u660e\u5206\u524d\uff0c\u8bf4\u201c\u5dee\u201d\u53ef\u8981\u7528\u4e0ato\uff0c
\u8bf4\u201c\u8fc7\u201d\u53ea\u53ef\u4f7f\u7528past\uff0c\u591a\u8bf4\u591a\u7ec3\u7262\u7262\u8bb0\uff0c
\u83ab\u8ba9\u5c81\u6708\u7a7a\u8e49\u8dce\u3002
\u4e0b\u9762\u5c31\u65f6\u95f4\u6982\u5ff5\u7684\u4ecb\u8bcd\u7528\u6cd5\u505a\u4e00\u7b80\u8981\u4ecb\u7ecd\u548c\u6bd4\u8f83\u3002
1--at\u8868\u793a\u65f6\u95f4\u6982\u5ff5\u7684\u67d0\u4e00\u4e2a\u70b9\u3002
\uff08\u5728\u67d0\u65f6\u523b\u3001\u65f6\u95f4\u3001\u9636\u6bb5\u7b49\uff09at 1\uff1a00\uff08dawn\uff0cmidnight\uff0cnoon\uff09\u5728\u4e00\u70b9\u949f\uff08\u9ece\u660e\u3001\u5348\u591c\u3001\u4e2d\u5348\uff09
These are our chief tasks at the present stage\uff0e\u8fd9\u4e9b\u5c31\u662f\u6211\u4eec\u73b0\u9636\u6bb5\u7684\u4e3b\u8981\u4efb\u52a1\u3002
2--on
1\uff09\u8868\u793a\u5177\u4f53\u65e5\u671f\u3002
They arrived in shanghai on May 25\uff0e\u4ed6\u4eec\u5728\u4e94\u6708\u4e8c\u5341\u4e94\u65e5\u5230\u8fbe\u4e0a\u6d77\u3002
\u6ce8\uff1a
\uff081\uff09\u5173\u4e8e"\u5728\u5468\u672b"\u7684\u51e0\u79cd\u8868\u793a\u6cd5\uff1a
at\uff08on\uff09the weekend \u5728\u5468\u672b---\u7279\u6307
at\uff08on\uff09weekends \u5728\u5468\u672b---\u6cdb\u6307
over the weekend \u5728\u6574\u4e2a\u5468\u672b
during the weekend \u5728\u5468\u672b\u671f\u95f4
\uff082\uff09\u5728\u5723\u8bde\u8282\uff0c\u5e94\u8bf4"at Christmas?\u800c\u4e0d\u8bf4"on Christmas?
2\uff09\u5728\uff08\u521a\u2026\u2026\uff09\u7684\u65f6\u5019\u3002
On reaching the city he called up his parents\uff0e\u4e00\u5230\u57ce\u91cc\u4ed6\u5c31\u7ed9\u7236\u6bcd\u6253\u4e86\u4e00\u4e2a\u7535\u8bdd\u3002
3--in
1\uff09\u8868\u793a"\u65f6\u6bb5"\u3001"\u65f6\u671f"\uff0c\u5728\u591a\u6570\u60c5\u51b5\u4e0b\u53ef\u4ee5\u548cduring\u4e92\u6362\uff0c\u524d\u8005\u5f3a\u8c03\u5bf9\u6bd4\uff0c\u540e
\u8005\u5f3a\u8c03\u6301\u7eed\u3002
in\uff08during\uff091988\uff08December\uff0cthe 20th century\uff09\u5728\u4e00\u4e5d\u516b\u516b\u5e74\uff08\u5341\u4e8c\u6708\u3001\u4e8c\u5341\u4e16\u7eaa\uff09
I returned to Beijing in the middle of June\uff0e\u6211\u662f\u516d\u6708\u4e2d\u56de\u5317\u4eac\u7684\u3002
\u4f46\u5982\u679c\u8868\u793a"\u5728\u67d0\u9879\u6d3b\u52a8\u7684\u671f\u95f4"\uff0c\u5219\u53ea\u80fd\u7528during\u3002
During my military service\uff08the trip\uff09\u5728\u6211\u670d\u5f79\u671f\u95f4\uff08\u5728\u65c5\u884c\u671f\u95f4\uff09
2\uff09\u8868\u793a\u4ee5\u8bf4\u8bdd\u65f6\u95f4\u4e3a\u57fa\u70b9\u7684"\uff08\u82e5\u5e72\u65f6\u95f4\uff09\u4ee5\u540e"\uff0c\u5e38\u7528\u4f5c\u5c06\u6765\u65f6\u6001\u8c13\u8bed\u7684\u65f6\u95f4\u72b6\u8bed\u3002
\u5982\u8fd9\u65f6\u8981\u8868\u793a"\uff08\u82e5\u5e72\u65f6\u95f4\uff09\u5185"\uff0c\u5e38\u7528within\u3002
\u6bd4\u8f83\uff1a The meeting will end in 30 minutes\uff0e\uff08\u4e09\u5341\u5206\u949f\u540e\uff09\u4f1a\u8bae\u4e09\u5341\u5206\u949f\u540e\u7ed3\u675f\u3002
Can you finish it within 30 minutes\uff1f \uff08\u4e09\u5341\u5206\u949f\u5185\uff09\u4f60\u80fd\u5728\u4e09\u5341\u5206\u949f\u4e4b\u5185\u5b8c\u6210\u8fd9\u4ef6\u4e8b\u5417\uff1f
\u4f46\u5728\u8fc7\u53bb\u65f6\u6001\u4e2d\uff0cin\u53ef\u7528\u4e8e\u8868"\u5728\u82e5\u5e72\u65f6\u95f4\u4ee5\u5185"\uff0c\u8fd9\u65f6\u4e0d\u8981\u8bef\u7528during The job was done during a week\uff0e\uff08wrong\uff09
The job was done in a week\uff0e\uff08right\uff09\u8fd9\u5de5\u4f5c\u5728\u4e00\u661f\u671f\u5185\u5c31\u5b8c\u6210\u4e86\u3002
4--after\u8868\u793a"\u5728\uff08\u67d0\u5177\u4f53\u65f6\u95f4\uff09\u4ee5\u540e"\uff0c\u6ce8\u610f\u4e0d\u8981\u548cin\u7684\u610f\u6df7\u6dc6\u3002
After supper\uff088 o\u2019clock\uff0cthe war\uff09\u665a\u996d\uff08\u516b\u70b9\u3001\u6218\uff09\u540e
\u6bd4\u8f83\uff1ahe will be back in two hours\uff0e\u4ed6\u5c06\u5728\u4e24\u4e2a\u5c0f\u65f6\u4ee5\u540e\u56de\u6765\u3002
He returned to his hometown after the war\uff0e\u6218\u540e\u4ed6\u56de\u5230\u4e86\u6545\u4e61\u3002
5--for\u8868\u793a"\uff08\u52a8\u4f5c\u5ef6\u7eed\uff09\u82e5\u5e72\u65f6\u95f4"\uff0c\u6709\u65f6\u53ef\u7701\u7565\u3002
I stayed in london\uff08for\uff09two days on my way to new york\uff0e\u5728\u53bb\u7ebd\u7ea6\u7684\u9014\u4e2d\uff0c\u6211\u5728\u4f26\u6566\u5446\u4e86\u4e24\u5929\u3002
6--since\u8868\u793a"\u81ea\uff08\u67d0\u5177\u4f53\u65f6\u95f4\uff09\u4ee5\u6765"\uff0c\u5e38\u7528\u4f5c\u5b8c\u6210\u65f6\u6001\u8c13\u8bed\u7684\u65f6\u95f4\u72b6\u8bed\u3002
since liberation\uff081980\uff09\u81ea\u4ece\u89e3\u653e\uff081980\u5e74\uff09\u4ee5\u6765
they have been close friends since childhood\uff0e\u4ed6\u4eec\u4ece\u5c0f\u5c31\u662f\u597d\u670b\u53cb\u3002
\u6ce8\uff1a
\uff081\uff09since the war\u662f\u6307"\u81ea\u4ece\u6218\u4e89\u7ed3\u675f\u4ee5\u6765"\uff0c\u82e5\u6307"\u81ea\u4ece\u6218\u4e89\u5f00\u59cb\u4ee5\u6765"\uff0c\u987b\u8bf4"since the beginning of the war"\u3002
\uff082\uff09\u4e0d\u8981\u5c06since\u4e0eafter\u6df7\u6dc6\u3002
\u6bd4\u8f83\uff1ahe has worked here since 1965\uff0e\uff08\u6307\u4e00\u6bb5\u65f6\u95f4\uff0c\u5f3a\u8c03\u65f6\u95f4\u6bb5\uff09\u81ea\u4ece1965\u5e74\u4ee5\u6765\uff0c\u4ed6\u4e00\u76f4\u5728\u8fd9\u513f\u5de5\u4f5c\u3002
he began to work here after 1965\uff0e\uff08\u6307\u4e00\u70b9\u65f6\u95f4\uff0c\u5f3a\u8c03\u65f6\u95f4\u70b9\uff09\u4ece1965\u5e74\u4ee5\u540e\uff0c\u4ed6\u5f00\u59cb\u5728\u8fd9\u513f\u5de5\u4f5c\u3002
7--by\u8868\u793a"\u5230\u2026\u2026\u7684\u65f6\u5019"\uff0c\u5176\u8c13\u8bed\u65f6\u6001\u7684\u7528\u6cd5\uff1a
\u52a8\u4f5c\u52a8\u8bcd\u5e38\u7528\u5b8c\u6210\u65f6\u6001\uff1b\u72b6\u6001\u52a8\u8bcd\uff08be\uff09\u5e38\u7528\u4e00\u822c\u65f6\u6001\u3002
\u6bd4\u8f83\uff1a by noon\uff0ceverybody had\uff08will have\uff09arrived there\uff0e
by noon\uff0ceverybody were\uff08will be\uff09there\uff0e
\u5230\u4e2d\u5348\u7684\u65f6\u5019\uff0c\u5927\u5bb6\u90fd\uff08\u5c06\uff09\u5230\u90a3\u513f\u4e86\u3002
现在分词的构成一般是在原形动词结尾加上-ing，如：
talk——talking
say——saying
speak——speaking
如果原形动词结尾有一个不发音的e，这个e我们把它称为silent e或者magic e，则去掉e再加上-ing，如：
have——having
write——writing
come——coming
注意以下几个字：
singe——singeing
dye——dyeing
canoe——canoeing
agree——agreeing
动词为重读闭音节或重读r音节结尾，末尾只有一个辅音字母（包括r，但x除外）时，先双写这个辅音字母再加-ing，如：
sit——sitting
run——running
spur——spurring
swim——swimming
begin——beginning
admit——admitting
forget——forgetting
occur——occuring
但是：mix——mixing，fix——fixing
以辅音字母c结尾的动词，先加上-k，再加上-ing，如：
picnic——picnicking
traffic——trafficking
panic——panicking
希望我能帮助你解疑释惑。
扩展阅读：怎么判断要不要加ing ... 什么时候加ing小口诀 ... 双写加ing的顺口溜 ... 什么时候改y为i再加ing ... 时间介词in on at口诀 ... v ing规则 ... 孩子发音in和ing矫正 ... 英语加ing的规律5种 ... in ing的标准发音视频 ...
