Put the verbs into the present continuous:Listen to the birds. They (sing) .Look at that one. It (fly) high in the sky.The other one (play) with a worm.I feel happy because I (have) a good time here in these woods.

Вот правильные формы Present Continuous:

1. Listen to the birds. They are singing.

2. Look at that one. It is flying high in the sky.

3. The other one is playing with a worm.

4. I feel happy because I am having a good time here in these woods.

Почему так: Present Continuous образуется из am/is/are + V-ing.

• They are singing — множественное число → are + singing.

• It is flying — единственное число → is + flying (fly + ing = flying).

• is playing — единственное число → is + playing.

• am having — с I используем am; у have при добавлении -ing отбрасываем «e»: having.