there were lots of snakes before,but now there are few.(改为同义句)there ____ ____ ____a lot of snakes,but now there are few.

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there were lots of snakes before,but now there are few.(改为同义句)there ____ ____ ____a lot of snakes,but now there are few.
there were lots of snakes before,but now there are few.(改为同义句)
there ____ ____ ____a lot of snakes,but now there are few.

there were lots of snakes before,but now there are few.(改为同义句)there ____ ____ ____a lot of snakes,but now there are few.
used to be
used to是助动词,后加动词原形的be,表示过去常常有,

used to be