sorry I don't know about 15, 16 and 20th question
The subject of the sentence "I read your blog post on the website" is "I". You can find the subject by asking yourself what is the person, place, or thing that is doing the 'doing' or is 'verbed'. Hope this helps! :)
Ana is the simple subject.
subject predicate
My sister's friend Ana/plays soccer.
When you witness an event you are watching it, when you are part of it, you are physically involved in some way. Hope this helps!
