| Base form (v1) | Complain |
| Past form (v2) | Complained |
| Past Participle (v3) -ed form |
Complained |
| Present Participle (v4) ‘ing’ form |
Complaining |
| Present simple (v5) s / es/ ies |
Complains |
Past continuous tense of complain verb forms - Learn English Free Online
