用be填空（我用来了）＿＿＿＿David and I in the same class? How

用be填空（我用来了）＿＿＿＿David and I in the same class?
How old____you last year?
There_____some people under the big tree.

第一个不肯定 are are

are were are 再看看别人怎么说的。