这句话语法对不对All he did was make me learn some Chinese characters

是正确的
你老是一定讲过不定式的省略吧,是的,当to do做表语的时候,恰巧前面有动词原形do或者是did的时候,做表语的不定式就省略了to
All he did was （to）make me learn some Chinese characters and do some dull reading.
All you can do is (to)wait until then
再问： 恩，估计讲过不记得，太早了，是什么时候讲的啊？高中还是大学？
再答： 必须是高中啊，我是高中的英语老师。讲非谓语动词的时候