Identifying the Incorrect Sentence Part

The sentence provided is "He has come yesterday." We need to find the part of the sentence that is grammatically incorrect.

Let's analyze the verb tense used and the time adverb:

• The sentence uses the present perfect tense ("has come").
• The time adverb "yesterday" indicates a specific, completed time in the past.

Grammar Rule: Present Perfect vs. Simple Past

The present perfect tense is typically used for actions that happened at an unspecified time in the past or actions that continue into the present. It is generally NOT used with specific past time adverbs like 'yesterday', 'last week', 'last year', 'two days ago', etc.

For actions that occurred at a specific time in the past, the simple past tense should be used.

Applying the Rule to the Sentence

In the sentence "He has come yesterday," the specific past time adverb "yesterday" requires the use of the simple past tense. The simple past tense of 'come' is 'came'.

• Incorrect: He has come yesterday. (Present Perfect with specific past time)
• Correct: He came yesterday. (Simple Past with specific past time)

Therefore, the phrase "He has come" is the incorrect part of the sentence when used with "yesterday".

Evaluating the Options

• 1. yesterday: This adverb correctly indicates the past time but is misplaced with the incorrect tense.
• 2. No error: This is incorrect as there is a grammatical error.
• 3. come: While 'come' is the past participle, the error lies in using the present perfect structure ('has come') with 'yesterday'.
• 4. He has come: This is the incorrect part because the present perfect tense is misused with the specific past time adverb 'yesterday'. The correct structure should use the simple past tense.

The incorrect part of the sentence is He has come.