These boxes were too heavy for them to raise.(句意不变）These boxes were ___difficult ___they____ raise____These boxes weren't______ ______for them _____raise.

只有wzh868 - 首席运营官 十三级 全对，大家要注意动词用过去式，包括情态动词：couldn't,不能用can't

These boxes were so difficult that they can't raise them.
These boxes weren't light enough for them to raise.

These boxes were so difficult that they couldn't raise them.
These boxes weren't easy enough for them to raise.

These boxes were so heavy that they can't raise .them
These boxes weren't light enough for them to raise.

so,that,can't,them
light enough,to
上学期刚学的,一辈子也忘不了啊

so...that....cannot....it
too heavy...to

1. so; ;that;can't; them
2. light enough; to