leaves turn green in spring为什么树叶要用复数?而不是leaf?如题..这问题有点弱智= =|

In s______,the leaves of trees turn green. 适当形式填空The leaves ---- (turn) green in spring.翻译我乘公共汽车回家.I ---- ---- ---- leaves turn green in spring为什么树叶要用复数?而不是leaf?如题..这问题有点弱智= =| In spring .The leaves ______ (turn) green.用动词的适当形式填空（并简要说明理由） Leafs turn green in spring. ( )turn green in spring.(grass) Ten leaf turn green in L___ turn green in spring Leaves ary green in spring是什么意思 Many trees____their green leaves in autumn. The leaves turn g_____ in spring? Leaves turn Yellow in auturm 中文 The leaves are green in spring对green提问 英语小练习 快1.She wants ------a doctor when she------up(be grow)2.The leaves-------green in spring.(turn）快 in,turn,the,spring,trees,green All the leaves turn green when the spring comes around的中文 Turn green The leaves are green in spring变一般疑问句