1.不可以 .what do you mean by doing sth 是很常用的固定句式,指 eg.What do you mean by giving me this letter?
2.你把 for the first time 提前到句首,就明白了.for the first time 其实也是固定的,指第一次做某事 eg.For the first time in my life,i travelled overseas when i was 20.
3.get + 形容词 ＋ with + sth/doing sth ,指在某事／做某事中使人很如何如何...