too to 太……以至于不能……
eg：Tom is too young to go to school.
Tom太小了以至于不能去上学.
too+形容词 to+行为动词
enough to 足够……可以……
eg：He is storng enough to do this work.
他足够强壮来做这份工作.
enough前+形容词
so that 太……以至于
eg：She was so sad that she couldn‘t say a word.
他太伤心了以至于他无法说出话来.
that后面跟从句
hear of + sb./sth:听到或知道某人[某事物]的情况
hear about + sth.:听到关於某事物的消息