1He has a friend who____ the piano very well.这种句型里的单词要加s还是原型

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1He has a friend who____ the piano very well.这种句型里的单词要加s还是原型?
2 I didn't know________.
A where does he live B where did he live
C where he lives D where he lived
这种句型的问句是怎么判断的?
3 Where_________live before you came here?
A did you used to B did you use to
C ues he to D he used to
这题为什么选B不选A呢?
第一题如果只有第三人称单数要不要加s呢？

应该是plays,因为前面a friend是单数所以定语从句谓语也是用单数,就是第三人称单数才加s的呀
D,首先这个是宾语从句,从句要用陈述语序,所以排除A,B,而且前面主句是过去式,所以从句要和主句一致也用过去时,所以选D
这个题是used to do改疑问句,是did you use to,因为前面已经用did了,动词用原形就好了.

1He has a friend who____ the piano very well.这种句型里的单词要加s还是原型 He plays the piano well.His parents think he’s very _______( He can't () the piano,but he () basketball very well. After___,he can play the piano very well. He plays the piano very well改为一般否定句 Lang Lang is s（） .He plays the piano well. He plays the piano well 同义句转换：He could play the piano very well when he was only fiv He is a_____ student,and he can play the piano very well. He can't play the piano,but he plays basketball very well. it makes her looks more ...里的LOOK是要原型还是可以加S 不是make sb do 把下面的单词按顺序排一排：1、has,dad,famous,he,a,very