Помогитееее,очень нужно!Put in there is,there are,there was,there were.
... many roses in your garden this year?
... many quests at your birthday party last year?

How

Put in there is,there are,there was,there were. Причем тут How

И к тому же получается, что там нету глаголов, а так нельзя

How many roses in your garden this yaer?How many quests at your birthday party last year?

 1. Are there many roses in your garden this year?2. Were there many guests at your birthday party last year?