как определить в каком времени Aktive стоит сказуемое (англ язык)

Вот у меня есть тест. Вот первое задание:

Задание 1. Определите, в каком времени Aktive стоит сказуемое:

1.We have brought a lot of berries from the wood.
2.Look! Jane is swimming across the lake.
3.What were they doing at six o’clock yesterday?
4.Have you ever seen the Pyramids?
5.I went to the Caucasus two years ago.

А вот второе:

Задание 2. Определите, в каком времени Passive стоит сказуемое:

1. Invitations have been sent to all the old pupils to be present at the school’s thirtieth anniversary.
2. All the passengers in the bus were listening to the story of the boy who had been saved from drowning by the quickness of the driver.
3. The work was finished on time.
4. The child is taken care of.
5. This book must be read by every student

А как делать я вообще не знаю. Помогите с двумя, лучше объясните