Q: かばんはかいましたか。

A: 1. はい、もうかいました。  
  2. はい、もうかってあります

Both answers also correct, but when should I use the second answer?

  • I think you can say that the te form you quote is used with auxiliary verbs. The meaning depends entirely on the auxiliary verbs in question. There are many auxiliaries. You mention いる、しまう、ある、おく. Others are みる、いく、くる. – Earthliŋ Jul 24 '16 at 20:46
  • 「~て」+「いる、しまう、ある、…」の「いる、しまう、ある、…」って、助動詞じゃなくて補助動詞ですよね。補助動詞って、subsidiary verb ではなく auxiliary verb とも訳されるんでしょうか。 – Chocolate Jul 25 '16 at 0:37
  • I've reopened the question because the asker has edited it to be more specific. – snailplane Jul 25 '16 at 6:26
  • You might want to wait to accept an answer. Someone might write a better one. – snailplane Jul 25 '16 at 7:59
  • 1
    Now I think it's a duplicate of this but I can't vote to close again... – Blavius Jul 25 '16 at 16:27
  1. かいました I bought
  2. もうかってあります I have bought

First is past tense. Second is present perfect tense. You would use the present perfect tense if you want to stress in the present time.

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