1.不知道完整的原句,抱歉无法给出准确答案（不过肯定是用what代替它）.
如：He doesn't know how to spend his weekend.
则划线提问后,为：What doesn't he know?或：What does he not know?
如果是同义句,则：how to spend his weekend = how he can/should spend his weekend
2.= You can spend two more hours playing football.
3.= Can (I borrow your MP5)?
= Can I (borrow the MP5 from) you?
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