M1
提建议
sb should do sth
why don't you do
it's a good idea to do
how about doing
try (not) to do
M2
has done (现在完成时)
问句：Have you (ever) done
答句：Yes,I have/No,I haven't
M3
sb have already done(已经做完用already)
sb haven't done yet /have sb done yet?(否定或疑问用yet)
M4
以下两种情况用现在完成时
for+一段时间
since+时间点
M5
反义疑问句
就记住“前肯后否,前否后肯”
表否定意义的词特殊：never,few/little,hardly,none,nothing,without.（你看个例句就明白了：You have few friends,do you?)
M6
过去进行时
很简单,was/were doing 强调过去正在进行某事
都是自己积累的,希望对你有帮助,现在开始努力还来得及!
望采纳.