\u82f1\u8bed\u4fee\u6539\u75c5\u53e5,\u9ad8\u624b\u8bf7\u8fdb\uff01

\u6211\u6765\u89e3\u91ca\u4e0b
1. if---- when if\u5982\u679c\uff0cwhen\u5f53...\u7684\u65f6\u5019
2. have--- has Alan\u4e3a\u7b2c\u4e09\u4eba\u79f0\uff0c\u540e\u9762\u7684\u8c13\u8bed\u9700\u7528\u5355\u6570have\u987b\u6539\u4e3ahas.
3. wrote--written \u73b0\u5728\u5b8c\u6210\u65f6\uff0c\u9700\u7528write\u7684\u8fc7\u53bb\u5206\u8bcdwritten\u3002
4. work---worked \u6216\u8005\u5c06have\u53bb\u6389
5. \u6211\u8ba4\u4e3a\u5e94\u8be5not has had--- has not had \u73b0\u5728\u5b8c\u6210\u65f6 \u8bb0\u4f4f\u5c31\u597d\u4e86
6. hasn't--- has \u524d\u5426\u540e\u5c31\u8be5\u80af\u4e86\u3002

\u628atheirs\u6539\u4e3athem\u3002\u56e0\u4e3awon\u662f\u52a8\u8bcd\uff0c\u5728\u6574\u4e2a\u53e5\u5b50\u4e2d\u5145\u5f53\u8c13\u8bed\uff0c\u6839\u636e\u201c\u4e3b\uff0b\u8c13\uff0b\u5bbe\u201d\uff0c\u540e\u9762\u5e94\u7528\u5bbe\u683c(them)\u5145\u5f53\u5bbe\u8bed\u3002PS:theirs\u662f\u540d\u8bcd\u6027\u7269\u4e3b\u4ee3\u8bcd\uff0c\u4e00\u822c\u201cbe\u52a8\u8bcd\uff08is\u3001are\uff09\uff0b\u540d\u8bcd\u6027\u7269\u4e3b\u4ee3\u8bcd\u201d\u3002