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2.以e结尾的直接加d
live-lived-lived move-moved-moved
3.以辅音字母加y结尾，把”y”改为“i”后加ed.
study-studied-studied cry-cried-cried
4、重读闭音节结尾，末尾只有一个辅音字母，先双写该辅音字母，再加“?ed?”
stop-stopped-stopped drop-dropped-dropped
动词的不规则变化：
AAA: read-read-read cut-cut-cut
ABB: have/has-had-had leave-left-left
ABA: run-ran-run become-became-become
ABC: go-went-gone drink-drank-drunk ring-rang-rung
练习：写出以下动词的过去式和过去分词
play- study-
go- start-
stop- run-
carry- have-
played-played
studied-studied
went-gone
started-started
stopped-stopped
ran-run
carried-carried
had-had
现在完成时长与一些时间状语连用：
1.常与just, already, before, yet, ever, never等词连用
I____ already _____ (finish) my homework.
have
finished
She _______ never _______(be) to Guilin.