小题1:They are going to play baseball tomorrow.

小题2:Jane often goes cycling twice a week

小题3:She was playing the guitar this time yesterday.

小题4:How cute the panda is.

小题5:We should wash hands before meals.

题目分析：

小题1:They are going to play baseball tomorrow.他们明天打算去打棒球。Be going to 打算做某事，用于一般将来时。

小题2:Jane often goes cycling twice a week .Jane经常一周两次骑自行车。Go cycling骑自行车；twice a week一周两次。

小题3:She was playing the guitar this time yesterday.她昨天这个时候在弹吉他。Was doing sth.过去进行时的结构，表示在过去的某个时间正在做某事；this time yesterday昨天这个时候。

小题4:How cute the panda is多么可爱的熊猫啊！这是由how引导的感叹句，how+形容词+主谓。

小题5:We should wash hands before meals.我们吃饭前应该洗手。Should 应该，情态动词；wash hands洗手。