English grammar verb rules :
Shortcut Rule 1 : If the subject is of the third person, singular number (He, She, It) add 'S' or 'es / ies' to the first form of the verb to make it singular number.
· She plays the violin every day.
· He loves his parents
· The dog barks at the people.
· The bird flies in the Sky.
· He does his duty.
Shortcut Rule 2 : The following verbs are not usually used in the continuous form. See / Smell / Feel / Hear / Notice / Recognize / See / Think / Agree / Believe / Consider / Remember / Hope / Understand / Mind / Suppose / Hate / Love / Know / Have / Want / Forgive / Keep / Prevent etc. But they may be used in continuous forms in a particular cases.
- He has a telephone connection
- The flower smells sweet (you can say I am smelling this flower)
Shortcut Rule 3 : The present perfect tense should not be used with adverbs indicating past time. Instead the simple past tense should be used.
- I saw a film last night.
- He left for Hyderabad last week.
Shortcut Rule 4 : The present perfect tense with "For or Since" is used to express an action began at some time in the past and is still continuing up to the time of speaking or just finished.
- I have know him since 1986.
- Our teacher has been sick for the last two days.
Shortcut Rule 5 : The present perfect continuous Tense" is also used for actions began in the past and are still continuing.
- I have been reading this novel since morning.
- They have been going to English classes for the last one month.
Shortcut Rule 6 : When the first action led to the second action immediately The simple Past Tense + Simple Past Tense are used.
· When he opened the gate, they came in.
Shortcut Rule 7 : When the first action completed before the second one started, the Past Perfect Tense for the first finished action and the Simple Past Tense for the Second are used.
The patient had died before the doctor arrived.
Shortcut Rule 8 : After negative sentences, the question tag used should be in an ordinary interrogative form.
- She did not like that book, did she?
- They have not told him the news, Have they?
Shortcut Rule 9 : After Positive Statements, we use the negative interrogative.