the principal delivered a speech today.1. The principal delivered a speech today, aiming at encouraging the students.今天校长讲话的主要目的是勖勉后学.可不可以用that aimed at ,还是说因为有逗号所以不能用,那为什么

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the principal delivered a speech today.1. The principal delivered a speech today, aiming at encouraging the students.今天校长讲话的主要目的是勖勉后学.可不可以用that aimed at ,还是说因为有逗号所以不能用,那为什么

the principal delivered a speech today.1. The principal delivered a speech today, aiming at encouraging the students.今天校长讲话的主要目的是勖勉后学.可不可以用that aimed at ,还是说因为有逗号所以不能用,那为什么
the principal delivered a speech today.
1. The principal delivered a speech today, aiming at encouraging the students.
今天校长讲话的主要目的是勖勉后学.
可不可以用that aimed at ,还是说因为有逗号所以不能用,那为什么要用aiming at

the principal delivered a speech today.1. The principal delivered a speech today, aiming at encouraging the students.今天校长讲话的主要目的是勖勉后学.可不可以用that aimed at ,还是说因为有逗号所以不能用,那为什么
这个是现在分词,做定语,修饰 speach
如果要改成定语从句,就要用 which is aimed,因为是在逗号之后,做非限定性定语从句.

可以是 which was aimed at ……,是一个定语从句。逗号表明后句为非限定性定语从句,引导词只能是which,不可用that。另外 be aimed at 的用法比较常见一些。