4a. is the correct form of the irregular verb become.
The presence of the helping verb, "has," means we must use the past participle, "become."
The principal parts are:
Present: The sweet little boys become monsters when they get together.
Past: Yesterday these boys became monsters when they got together.
Past Participle: Those boys have become monsters many times.
is the following statement a regular or irregular verb and why.
John has become a rather good actor.
4b. John has became a rather good actor
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