teach-,s,把y变为i再加-es.例如:study-studies;try-tries;carry-carries,catch-catches,wash-washes,动词第三人称单数变化规则1)一般情况下,fix-fixes2)以ch,动词后面直接加-s,动词变三单的规则,在后面加-es,x或o结尾的动词,sh,