Объясните почему вы поставили глагол в том или ином времени

Когда мы смотрим на небо,мы видим облака. Настолько они прекрасны,что ими можно любоваться часами.

 Однажды смотря на облака,я увидела птиц.Они были прекрасны,и неповторимы, они летели на юг.

   Я не заметил ,как пролетело время...Очень жаль,что они уже улетели я не могу любоваться ими каждый день .

When we look at the sky we see the clouds. They are So beautiful that they can enjoy for hours.

One day looking at the clouds,I saw birds.They were beautiful and unique, they flew to the South.

I did not notice how time flew by...it's a pity they already left I can't admire them every day 

I got up at 10 o'clock, and then I went to have breakfast. After breakfast, I went to take a shower. And as always, I then entered the Internet and spent about an hour on Instagram. Then I packed up and went to the KidsTV Cinema and Television School to rehearse a dance for the self-management day. Today is my brother's birthday. When I came home, my whole family had gathered at the celebration table. We celebrated the birthday and each went to do their own chores. I went to do my homework. Having done my homework, I went for a shower and  after taking a shower I went to bed. Here's the day I've had.