More Rules :

Rule 11:

Modals always take the base form of the verbs after them. See Modals for details.

Rule 12:

The clause ‘it is time’ or ‘it is high time’ requires a verb in the simple past if there is a clause after it.

It is high time + subject + simple past. . . .

It was high time + subject + past perfect . . .

It is high time + infinitive . . . . . . .

 Example:

• It is high time you studied attentively.
• It is time to study attentively. (You can replace the clause by an infinitive removing the subject)
• It was high time we had returned home. (It was high time requires past perfect tense)

Rule 13:

The conjunction as if/as though takes simple past/past perfect tense in the following clause.

Subject + simple present + as if/ as though + subject + past simple

Subject + simple past + as if/ as though + subject + past perfect

 Example:

• Robert talks as if he were the prince. (Were is the only ‘be verb’ in this kind of sentence)
• Latham played as though he had seen the ball very clearly.
• I slept as if I had been dead.
• He behaves as if he were her husband.

Rule 14:

Prepositions, articles, and possessives are always followed by nouns or gerund form of the verbs.

Example:

• He is keen on moving to California.
• I am thinking about doing the job.
• Alex insisted on going out then.

Rule 15:

To is the only preposition that takes the base form of the verb. However, there some phrases with to being at the end of them, which require the gerund form of the verbs.

With a view to, look forward to, being accustomed to, being used to, admit to, confessed to

 Example:

• He went there with a view to confessing his crimes.
• I am looking forward to meeting the princess.
• I was used to sleeping at this hour of the day.
• He confessed to stealing that phone.

Rule 16:

To be, being, having, getting, etc. are generally followed by the past participle form of the verbs and other adjectives.

Example:

• Being tired, he took some time off from work.
• He became astonished being robbed in the daylight.
• John went to bazar having eaten a burger.
• He wanted to be educated.

Rule 17:

The causative verbs always take the next verb in its base form. See causative verbs and their usages.  

HAVE – GET – MAKE  – HELP – LET

*Note: Get takes the next verb as infinitives/past participle.

Example:

• I had him wash the dishes.
• He makes me do all the work.
• He got me to make his dinner.
• I got the glass broken.
• Let him help her finish the assignment.

Rule 18:

The base form of the verb is also used in the clauses that use the subjunctive mood. Some certain verbs + the conjunction that requires the next clause to use the subjunctive mood and the clause uses the base form of the verb in it.

The verbs are:  

Advise – demand – prefer – require – ask – insist Propose – stipulate – command – recommend  Suggest – decree – order – request – urge – move

Structure:

Subject + the verbs of the above box (any tense) + THAT + subject + base verb + .  .  .  .  .

Example:

• He insisted that I stay at home.
• The office requires that we complete our work timely.
• She commanded that he stop making excuses for being late.
• I recommend that you wake up early.

Note: There are some clauses also which require the verb of the next clause to be in base form.

The clauses are:

It is/was + past participle form of the verb of the above box + THAT It is/was urgent + THAT It is/was necessary + THAT It is/was important + THAT

Example:

• It is important that you invite him.
• It was necessary that I make a fence.
• It was recommended that you meet the principal.

Rule 19:

Since a single clause cannot take two verbs, it usually converts the additional verbs to complement by making them infinitives or participles or gerunds.

– Some verbs always take the additional verbs as a complement by making them infinitives.

Verbs followed by the INFINITIVES

agree – desire – hope – plan – attempt – claim – decide – demand – expect – intend – prepare – tend – fail – learn – pretend – want – wish – refuse – need – forget – hesitate – offer – seem

Example:

• He agreed to do the job.
• He desires to go to Disneyland.
• I want to work with you.
• He failed to understand my words.

Verbs followed by the GERUNDS

appreciate – admit – delay – miss – report – suggest – deny – postpone – resent – avoid – enjoy – practice – resist – can’t help – finish – quit – resume – consider – mind – recall – risk

Example:

• He admitted doing the crime.
• We enjoyed riding the boat.
• I can’t help loving you despite your stupidity.
• Would you mind opening the door for me?