1.--The new machine

1.--The new machine ____last month is very popular now.(正解：invented,错解：was invented)
2.Can I go out to play after my homework ____?(正解：was finished 错解：is finished)
3.The song____by Jay Chou is very popular with young people.(正：sung,错：sang)
4.-Why not ask your father for help?
-He is not at home.If he___,I____.(正：were,would错：is will)
5Could you please ask George if he___to plant trees with us?(正：will go错：went)

1正解是过去分词 作定语
错 解 是谓语形式 本句已经有谓语
如果 用谓语形式 句子应是
The new machine was invented last month ,which is very popular now
2你的正解是错的 错解是对的
答案应该是 一般现在时
主句是一般将来时或祈使句或含情态动词时 时间状语从句 用一般现在时
故答案 是is finished
3道理同第一题 一样
4这是与现在情况 相反 的虚拟语气
if从句 用过去时 be动词 必须用were 主句 用过去将来时
错解 是真实句 因为有前句 故用真实条件句 错
5这是宾语从句 事情尚未发生 故用一般将来时