<p>1) (I / go / to the library today) I have gone to the library today.</p>
<p>2) (you / keep a pet for three years) You've kept a pet for three years.</p>
<p>3) (you / come here before)? Have you come here before?</p>
<p>4) (it / rain all day)? Has it rained all day?</p>
<p>5) (who / we / forgot to invite)? Who have we forgotten to invite?</p>
<p>6) (we / not / hear that song already) We haven't heard that song already.</p>
<p>7) (he / not / forget his books) He haven't forgotten his books.</p>
<p>8) (she / steal all the chocolate) She's stolen all the chocolate.</p>
<p>9) (I / explain it well)? Have I explained it well?</p>
<p>10) (who / he / meet recently) Who has he met recently?</p>
<p> </p>