Perfect tense in complex sentence/Совершенное время в сложном предложении

Perfect tense in complex sentences
Can you tell me how you would use the present perfect tense in a complex sentence?
Совершенное время в сложном предложении
I have finished my homework before I went to the party .
I have read the book before discuss it with my friends .
It sounds like you have a lot of on your plate. Balancing time between learning languages and taking care of your daughter can be challenging
1. Setting aside just 10 minutes each day to read a short article
2. Write a few sentences about your day or a story in English
I have eaten lunch before I discuss my plants with my friends
I have been studying a lot before I went to the UK
I have cried a lot since I left here