back前要加to吗?为什么?they carried a lot of things (to back) homeback前要加to吗?为什么?they carried a lot of things (to back) home

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back前要加to吗?为什么?they carried a lot of things (to back) homeback前要加to吗?为什么?they carried a lot of things (to back) home

back前要加to吗?为什么?they carried a lot of things (to back) homeback前要加to吗?为什么?they carried a lot of things (to back) home
back前要加to吗?为什么?they carried a lot of things (to back) home
back前要加to吗?为什么?
they carried a lot of things (to back) home

back前要加to吗?为什么?they carried a lot of things (to back) homeback前要加to吗?为什么?they carried a lot of things (to back) home
back前面不要加to
back 在这里应该是副词,动词+副词不用加to,back表状态

这里是back的副词用法 不是动词 不需要加to构成动词不定式