have 是動(dòng)詞原形用于一般現(xiàn)在時(shí).I have a book
has是動(dòng)詞的單數(shù)第三人稱(chēng)形式用于主語(yǔ)是第三人稱(chēng)的一般現(xiàn)在時(shí) He has a book.
had是動(dòng)詞have的過(guò)去式用于一般過(guò)去時(shí).He had an exam yesterday.其他的會(huì)嗎會(huì)is 用于主語(yǔ)是第三人稱(chēng)的一般現(xiàn)在時(shí)或現(xiàn)在進(jìn)行時(shí)。如 He is tall .He is talking with a friend.are用于主語(yǔ)是第二人稱(chēng)或各種人稱(chēng)的復(fù)數(shù)。如You are a student . We arehappy . The students are playing on the playground.was是 is ,am的過(guò)去式用于一，三人稱(chēng)的單數(shù)的過(guò)去時(shí)中。如He was ill yesterday. I was at home yesterday. were是are 的復(fù)數(shù)用于第二人稱(chēng)和各種人稱(chēng)的復(fù)數(shù)形式。用于過(guò)去時(shí)we were tired . My books were on the desk just now.