把三个编号分别为1,2,3的动词的变位形式，依次填在相应编号的框内。
1.pouvoir
je[____1____] tu[____2____] il/elle [____3____]
nous[____4____]vous[____5____]ils/elles[____6____]
2.convaincre
je[____7____] tu[____8____] il/elle [____9____]
nous[____10____]vous[____11____]ils/elles[____12____]
3.servir
je[____13____] tu[____14____] il/elle [____15____]
nous[____16____]vous[____17____]ils/elles[____18____]