Each
Incorrect : Each boy have his own room.
Correct: Each boy has his own room,
Incorrect : They each has their own room
Correct : They each have their own room.
Note : Each is usually singular, except after a plural subject. When each of is followed by something long, you can use either a singular or plural verb. For example:
Each of the four students of my tutorial group is/are writing an essay on a different subject.
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