为什么he is要缩写成he's

He‘s 是那个缩写 是指He has 的缩写还是He is的缩写 英语缩写!【比如 He is =He's】之内的, he's的缩写 he is缩写 he is的缩写 he was 到底能不能缩写成he's HE`S是什么的缩写是he is 还是he has 英文句子缩写,比如：Let us=Let's he is=he's he has=he's he have=he've He was 能否缩写为 he's? he's like a father to me中的he's为什么要加is he has有缩写形式吗?如果有he's 那不是和he is的缩写he's混了吗? he is的缩写是什么?