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4.能够对同伴的健康生活方式进行调查，并且选择最适合自己的锻炼方式,并陈述理由。
do/take some exercise
做一些锻炼
fast food 快餐食品
in excellent condition
健康状况很好
Doctor: Can I help you? /What’s wrong with you?
Patient(病人):I have caught a cold/ I’ve
got a stomach ache/headache…
Doctor: How long have you been like this?
Patient: For about 3 days/Since Friday…
Doctor: let me have a look.
Patient: I want to be in excellent condition.
So what should I do?
Doctor: Don’t worry. Keep eating healthy food
and doing some exercise every day. And take
the medicine three times a day.
Patient: Thank you.
1.观看微课，了解有关现在完成时各种用法的总结。
2.同时，快速及时地完成相关的各种练习题，并用红笔改正错误答案。
For, since，短暂性动词和延续性动词的用法。
1.在现在完成时中，for加时间段，since加时间点或者句子（过去时）。
2.短暂性动词能用于现在完成时的肯定句，但是不能和for或者since引导的时间状语连用；
短暂性动词在否定句中，能和for或者since引导的时间状语连用。
3.延续性动词能用于现在完成时的肯定句和否定句，并且都能和for或者since引导的时间状语连用。
一.用for 或者since 填空
1.We feel fit because we have played tennis (for/since)
one year.
2.Peter keeps doing some exercise and he hasn't caught
a cold (for/since) last winter.