Posted by Henry2 on Tuesday, November 29, 2011 at 10:06am.
1. comma needed
2. OK
3. OK
You can also refer to these verb forms as the 2nd and 3rd principal parts of a verb. The 1st principal part of a verb is the basic form.
1st principal part (present): walk, talk, teach, sing...
2nd principal part (simple past): walked, talked, taught, sang...
3rd principal part (past participle): walked, talked, taught, sung...
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