they can do a lot of things.变成否定句,和一般疑问句

They can't do a lot of things
Can they do a lot of things?
再问： 我开始是这么写的，老师给判错了，a lot of 要变成much或者many
再答： 对了，A LOT OF 一般不用于否定句和疑问句。 They can't do many things Can they do many things?
再问： 一般疑问句也要变，老师讲的