How many fish were there?There were (посчитаете количество рыб и напишите), например six fish.(окончание es здесь не надо добавлять, это слово-исключение)
How many mountains were there? There were...( пишите количество)mountains.
How many eggs were there?There were...eggs.
How many trees were there?There were...trees.
How many lakes were there?There were..lakes
How many rivers were there?There were..rivers.
How many dinosaurs were there?There were six dinosaurs.