を除いて means "except", "excluding": the noun in front of it is taken out of a group, and the rest of the sentence is about everyone or everything else. It goes straight after a noun, which takes because is a transitive verb, "to remove".
、。
Everyone agreed except for him.
、。
We are open every day except Sunday.
、。
All items are on sale, excluding some products.
The second half usually has a word for the whole – , , – or a negative with or .
、。
Nobody knew about the plan except the president.
を除いて or 以外
says the same thing and is the everyday word. It goes straight after the noun with no を, and を除いて sounds more deliberate, the way rules and notices exclude something.
、。
Nobody knew except Tanaka.
、。
Nobody knew except Tanaka.
is the written form, for notices and announcements.
adds は to stress the exception.
is "if you leave out ~", for a judgment about what remains.
、。
Anyone can participate, excluding minors.
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With the exception of this room, all rooms have been cleaned.
、。
Apart from the price, it's a good hotel.
Before a noun, the form is を除いた.
。
The members, excluding her, discussed it.