YOU SAID:

when for is thicker then the trees

INTO JAPANESE

樹木の方が太いときに使う。

BACK INTO ENGLISH

I use it when the trees are thicker.

INTO JAPANESE

木が太い時に使っている。

BACK INTO ENGLISH

I use it when the tree is thick.

INTO JAPANESE

木が厚いときに使っている。

BACK INTO ENGLISH

I use it when the tree is thick.