There are many needy families in our village.
我们村子有很多贫困家庭.
There are many cedars in this park.
这个公园里有许多香柏.
There are rows of tents at the foot of the mountain.
山脚下有几排帐篷.
I guess there are mice in the kitchen.
我猜想厨房里有老鼠.
There are 30 pupils in the class.
这个班有30名学生.
There are 300 students or so in this middle school.
这所中学大约有300个学生.
On the average,there are 300 tourists a week.
每星期平均有300游客.
There are more than 5,000 adjectives in that dictionary.
那本词典中有5000多个形容词
There are lots of trees in the yard.
There are lots of dogs in the yard.
There are lots of cats in the yard.
There are lots of cars in the yard.
There are lots of cupsin the yard.
There are Few students in the classroom.
There are thirty desks and chairs in it.
There are four seasons in a year,and spring is the best one.
PS：自己再把这些句子改为一般疑问句和否定句吧,应该足够50句了.