СОС

We back from an excursion. (just COME)

They said it

wonderful. (BE)

Now we can understand nature

(GOOD)

We learnt about

environment a lot. (WE)

СОС ОЧЕНЬ

We have just come back from an excursion.
They said it was( не очень уверена) wonderful.
Now we can understand nature better.
Не понимаю, что нужно сделать с we.