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1. I can't find my wallet. Who ___________ it？(take)
2. She ___________the Great Wall several times.(visit)
3. There _______once a cinema here. (be)
has taken
has visited
was
曾经
(b)构成不同
一般过去时：
现在完成时 ：
主语+动词的过去式+句子剩余
主语+ have/has +过去分词+句子剩余
句型转换
1. He had to stay up late last night. (否定句）
2. He often has bread for breakfast. (否定句）
3. He's learnt two foreign languages so far. (一般疑问句）
He didn't have to stay up late last night.
Has he learnt two foreign languages so far?
He doesn't often have bread for breakfast.
(c)具体的时间状语不同
（1） 一般过去时的时间状语
（2）现在完成时的时间状语
yesterday, once(曾经), last week, 一段时间+ago,
just now, in +过去的年份, the other day, this morning...
for, since, so far, up to now, ever, never,
just, already, yet, recently, lately,
in/over/during the last/past years
Practice：
1. I________(lose) my pen just now.
2. I________ just _____(lose)my pen .