could might must 后面要加動(dòng)詞原形
當(dāng)是形容詞,名詞或者動(dòng)詞ing形式（動(dòng)名詞）的時(shí)候就要在could might must 后面先加be
Is the strange creature an alien (could)
The strange creature could be an alien.
Is she looking for something (must )
She must be looking for something.
這里是動(dòng)名詞,要先加be
Dose gesture mean "hello"?(might)
The gesture might mean "hello".
這里mean就是動(dòng)詞原形,可以直接加
Will our team win the match (could)
Our team coule win the match.
Is the woman with a camera coming to our school (most
The woman with a camera must be coming to our school.