Example: 1. I heard the song. It was sing twice
-I heard the song sung twice
2. I heard her. She was singing in the bathroom
- I heard her singing in the bathroom

exercise
1. The people saw the thief. He ran away
2. We found the students. They were having a discussion.
3. They found the village. It was deserted
4. The students came on time yesterday. Did you ask them?
5. She comes late every day. We shouldn't let her.
6. She heard me. I was talking about her.

Can u answer this? please help​

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."

a complex sentence consists of an independent clause and one or more dependent clauses.  

to write complex sentences, we must use subordinating conjunctions.  

all the complex sentences begin with a subordinating conjunction and when it occurs, a comma must be place at the end of the dependent clause. on the contrary, if the sentence begins with an independent clause, then no comma is used.

after  

although  

as  

because  

before  

if  

since  

when  

for example,  

after she won the competition, she became very popular.  

although my father was hurt, he continued fighting for his rights.  

as all of you got a ten, you will be able to leave early today.  

before he went to the war, he asked his parents to bless him.  

if it is cold, i won’t go out.  

since you didn’t bring the homework, you will get low grades.  

when it is hot in the town, everyone goes to the beach.