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 ...
