现在完成时和一般过去时专项练习一、用所给单词的正确形式填空。1.-_ you _ (have) lunch yet? -Yes,I .- When_ you _ (have) it? -I_ (have) it at 12:00.2._ she _(write) a letter to her aunt yet? Yes, she_ . She_ (write)it the day before yesterday3. -_ you_ (find) your knife yet? -Not yet.4. I _(sing) the English song before.5. I _ never _(see) him before.6. She_ just _(ride) a horse?7.Tom with his mother _(shop