三单变化:(1)直接在动词词尾加-s, ask-asks work- works stay – stays
( 2) 以字母s, x, sh, ch, 或o结尾的动词,在词尾直接加 – es
watch- watches wish –wishes fix –fixes go – goes pass-passes
( 3) 以“辅音字母加-y”结尾的动词,要先变y为i再加-es
try-tries study- studies cry- cries fly- flies
(4)不规则变化: be-is have – has
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