我来解释下
1. if---- when if如果，when当...的时候
2. have--- has Alan为第三人称，后面的谓语需用单数have须改为has.
3. wrote--written 现在完成时，需用write的过去分词written。
4. work---worked 或者将have去掉
5. 我认为应该not has had--- has not had 现在完成时 记住就好了
6. hasn't--- has 前否后就该肯了。
1. if---- when
2. have--- has
3. wrote--written
4. work---worked
5. not has had--- has not have
6. hasn't--- has
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