There are several opinions of Grammar experts regarding Present Perfect Tense, including those of Raymond Murphy (2003: 14) regarding Present Perfect Tense, he argues:
"When we use the present perfect there is always a connection with now. The action in the past has a result now. And when we talk about a period of time that continues from the past until now, we use the persent Perfect."
Meanwhile, according to Jeffrey Coghill and Stacy Magendanz (2003: 96) also shared opinions about the Present Perfect Tense, they agreed:
Despite its name, present perfect tense normally does not refer to actions occurring in the present. Instead, it most often refers to actions completed in the past that have some consequence or effect on the present situation."
B. Present Perfect Tense Formula
Below is a Present Perfect Tense formula for three types of sentences, namely Positive Sentence, Interrogative Sentence, and Negative Sentence.
Positive (+)
S + Have / has + V III + O
Interrogative (?)
Have / has + S + V III + O
Negative (-)
S + Have / has + Not + V III + O
*Information:
S: Subject
Have / has: Is an auxiliary verb used in the Present Prefect Tense which means "already". "Have" is used for the subject they, we, I, you and "has" used for the subject he, she, it.
V III: Is a third form of verb.
O: object
C. Changes V III to the Present Perfect Tense
As we know, there are some changes that occur in Verb Bare Infinitive (pure verbs that have not received a supplement), from V I to V II and V III. There are two types of changes involving changes in Verb (verb), there are changes that are regular (regular) and some are irregular (irregular).
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1. Regular Verb
For regular verb changes we only add the suffix "-ed" at the end of the verb. This applies to changes in V II and V III.
| V I | V II | V III |
| Try | Tryed | Tryed |
| Work | Worked | Worked |
| Look | Looked | Looked |
| Finish | Finshed | Finished |
| Travell | Travelled | Travelled |
| Talk | Talked | Talked |
| Use | Used | Used |
2. Irregular Verb
In addition to regular changes, there are also irregular changes.
D. Form Present Perfect Tense
(+) I have worked
(-) I have not worked
(?) Have I worked?
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