These lessons learned through:

Unit 1: Computers
RELATIVE CLAUSE
1.Relative clause begins with ralative pronoun (who, who, which...)
2. Stands right after a noun modify that noun
3. We use relative clauses to combine two sentences

HOW TO COMBINE TWO SENTENCES
- Find out  the same poils in two sentences
- Take care: the first are  must be a noun
- We choose who, whom or which depend on the role of the second one
- Put that ralative clause right after the first noun

EX:
The cat is Tom. It is on the sofa
-> The cat which is on the sofa is Tom
The man is nice I invited him to my party last
-> The man is nice whom I invited to my party last

Unit 2: Computer capabilities and limitations
PASSIVE VOICE
1. Find out the Subject and the Object
2. Turn the Object into Subject and the Subject into "by Object"
3. Change the Vern into "be +  V3" (take care: tense of  "BE" is tense of Verb in active sentences

EX
After class, one of the students earases the chalkboard
 one the students (S),   the chalkboard (O)
-> After class, the chalkboard is earased be one of the students