翻译 1.他每个星期做实验.（否定句、一般疑问句、两答）2.他现在正在做实验.（否定句、一般疑问句、两答3.他昨天做实验了。否定句、一般疑问句、两答）4.他下周要做实验了。否定句、

翻译 1.他每个星期做实验.（否定句、一般疑问句、两答）2.他现在正在做实验.（否定句、一般疑问句、两答3.他昨天做实验了。否定句、一般疑问句、两答）4.他下周要做实验了。否定句、
翻译 1.他每个星期做实验.（否定句、一般疑问句、两答）2.他现在正在做实验.（否定句、一般疑问句、两答
3.他昨天做实验了。否定句、一般疑问句、两答）
4.他下周要做实验了。否定句、一般疑问句、两答）

翻译 1.他每个星期做实验.（否定句、一般疑问句、两答）2.他现在正在做实验.（否定句、一般疑问句、两答3.他昨天做实验了。否定句、一般疑问句、两答）4.他下周要做实验了。否定句、
He does experiments every week.
He doesn't do experiments every week
Does he do experiments every week?
Yes,he does/ No,he doesn't.
He is doing the experiment now.
He isn't doing the experiment now.
Is he doing the experiment now?
Yes,he is./No,he isn't.