You can't do your homework while you're watching TV.
你不能一边看电视一边做家庭作业。
Can I watch TV now? No, you can't. You should do your homework first.
我现在可以看电视了吗？不，你不可以。你应该先做你的家庭作业。
You can't ask me to do your homework for you.
你不能要求我替你写作业。
You can't be too careful when you do your homework.
你做作业时，再小心也不过分。（越小心越好）
You can't be too careful when you do your homework.
你做作业时，再小心也不过分。（越小心越好）
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