The present participle is "costing", and the present indicative tense is "cost" except for the third person singular, which is "costs".
present-cost present participle-costing past-cost past participle-cost
Lead is present tense. The present participle is leading. Led is the past tense and past participle.
Am is the present tense, first person singular conjugation of be. The past tense is was, and the past participle is been.
Strike is the present tense, and struck is the past tense and past participle.
Pulled is the past tense and past participle of pull. Pulling is the present participle.
The past tense is bit. The present participle is biting. The past participle is bitten.
The past tense is ate.The present tense is:I/You/We/They eat.He/She/It eats.The past participle is eaten.
The present tense is "come". The past participle is "come", as well. "Came" is the past tense.
The past tense and past participle is equipped; equipping is the present participle.
The past participle is done. The simple past tense is did. The present participle is doing.
Forget is the present tense. The past tense is forgot, the past participle is forgotten, and the present participle is forgetting.
Present tense - singing Past participle - sung