be doing sth. 什么意思

Be doing sth\u662f\u4ec0\u4e48\u610f\u601d

Be doing sth
\u505a\u67d0\u4e8b

Be instrumental in doing sth for sb.
\u4e3a\u67d0\u4eba\u5e72\u67d0\u4e8b\u51fa\u529b\u3002

be doing sth\u2026when\u6b63\u8981\u505a\u67d0\u4e8b,\u6070\u597d
when \u540e\u9762\u7684\u90a3\u4ef6\u4e8b\u60c5\u53d1\u751f
\u4f8b\u53e5\uff1a
1\u3001I was watching the football match when he came in.
\u5f53\u4ed6\u8d70\u8fdb\u6765\u7684\u65f6\u5019\u6211\u6b63\u5728\u770b\u8db3\u7403\u8d5b\u3002
2\u3001He asked me what I would be doing when he came the next day.
\u4ed6\u95ee\u6211\u5f53\u4ed6\u7b2c\u4e8c\u5929\u6765\u7684\u65f6\u5019\u6211\u4f1a\u5728\u5e72\u4ec0\u4e48\u3002

\u6269\u5c55\u8d44\u6599
\u540c\u4e49\u8bcd\uff1abe on the point of doing sth.when...\uff08\u6b63\u8981/\u5373\u5c06\u2026\u2026\u7684\u65f6\u5019\uff09
\u4f8b\u53e5\uff1a
1\u3001She was on the point of going out when the telephone rang.
\u5979\u6b63\u8981\u51fa\u53bb,\u7535\u8bdd\u94c3\u54cd\u4e86\u3002
2\u3001I was on the point of going to bed when you rang.
\u4f60\u6765\u7535\u8bdd\u65f6\u6211\u6b63\u8981\u7761\u89c9

正在做某事
I am doing homework.
我正在写作业

正在做某事

扩展阅读：ask sb doing sth ... be free doing sth ... saw sth ding sth ... be longing to do ... be used to doing ... be believed doing ... its no use doing sth ... favor doing sth ... save doing sth ...