Tìm lỗi sai trong những câu sau

Tìm lỗi sai trong những câu sau
SOS 
Tìm lỗi sai trong những câu sau và sửa lại cho đúng :
 Why was your children happy ?
There were a desk and two chairs in the zoom
How many stars was there in the sky lastnight
Last year, Susan were in class 4A
Where was your sons yesterday ?
The cat and the dog was on the table