Quick Grammar

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A number of verb forms exist. These include root, singular, third-person, present, past and past participle.

Root Form of the Verb
Just as it sounds, this is the base form that a word assumes. Thus, root verbs have no suffixes or prefixes since they are not conjugated. It is basically the infinitive form of the verb without "to." Here are a few examples. 
to come – come, to sleep – sleep, to buy – buy, to work – work
When conjugated, the root form of a verb can create other verb forms. But this is not always the case with irregular verbs as it is with regular verbs. Let's see the following examples.
He is walking to the park
(Root: walk)
How did he do it?
(Root: do)
Peter read to his mother, the speech he wrote yesternight.
 (Root: read)
Paul already bought five phones in 2 years.
(Root: buy)

Third Person Singular Form of a Verb
A slightly different conjugation is seen with third-person singular pronouns she, he, one and it. The verb form for regular verbs ends in –s or –es when they conjugate with these pronouns. E.g.  She walks, he plays, it bulges, etc.

Present Participle Form of a Verb
This form of a verb is formed when –ing is added to the root verb. Here are some examples;
They are going to see his uncle. 
 (go– going)
He has been writing since noon.
 (write – writing)
He is driving his uncle's car.
(drive– driving)

Past and Past Participle Forms of the Verb
The past tense is formed when –ed or –d is added to the root word.
He pulled his teammate up from the ground.
(pull – pulled)
The strange animal I saw walked on two feet,
(walk– walked)
He prepared for the exam.
(prepare – prepared)
A few irregular verbs have past participle forms that can be quite mazy to determine. So, you'll want to check your dictionary if you have problems picking the right form of an irregular verb. Let's look at a few irregular verbs.
Root  Simple Past   Past Participle
Ring      Rang            Rung
Bite       Bit              Bitten
Sleep    Slept         Slept

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