YOU SAID:
Tree decided to have a cup of tea
INTO JAPANESE
木はお茶を飲むことにしました
BACK INTO ENGLISH
tree decided to drink tea
INTO JAPANESE
木はお茶を飲むことにした
BACK INTO ENGLISH
The tree decided to drink tea
INTO JAPANESE
木はお茶を飲むことにした
BACK INTO ENGLISH
The tree decided to drink tea
That didn't even make that much sense in English.