这句意思很明显
如果你检查的仔细点,一些拼写错误是可以被避免的.
第一个是表示已经仔细检查过了,第二个是错的,第四个是表示一个目的,而不原因那A的这种用法适合用在哪里？？还有havingdone 和doing如果在句首用哪个给你举个例子

Having checked his composition careflully, Jim hand it over to the teacher and leave.

Jim went to the playground, playing football.

伴随状语不被主句时态影响