English Grammar and Usage

'Currently' means at the present time and is the correct word here. 'Presently' actually means 'soon' or 'shortly' in formal English, not 'at present'. Both 1 and 2 is incorrect because the meanings differ.

'Well' is an adverb that modifies the verb 'doing', making it the correct choice. 'Good' is primarily an adjective, though informal usage accepts 'I'm good'. In the question 'How are you doing?', the response requires an adverb to describe the action of doing, so 'doing well' is grammatically correct.

'Really' is an adverb that modifies the adjective 'tired', making it grammatically correct. 'Real' is an adjective, not an adverb. While informal American English sometimes uses 'real' as an adverb, standard English requires 'really' for emphasis.

Duration phrases with 'ago' don't require a preposition. The correct phrasing is 'I completed the XYZ project two months ago' - no preposition before the duration. 'Ago' itself functions as an adverb indicating past time, making additional prepositions unnecessary and incorrect.

In French, 15h15 (3:15 PM) is expressed as 'trois heures et quart' (three hours and a quarter) when using the 12-hour format. 'Moins le quart' would be 2:45, 'plus le quart' is not standard phrasing, and 'et demi' would be for half-past the hour.

The correct answer is 'I had sent the mail yesterday.' The original sentence incorrectly uses the base form 'send' with the past perfect auxiliary 'had.' Past perfect requires the past participle form 'sent.' Option B incorrectly uses 'have send' (present perfect with base form), Option C incorrectly uses simple present 'send' for a past action, and Option D 'have sent' is grammatically correct present perfect but doesn't match the past perfect structure of the original sentence.

The negative of 'do' in third-person singular is 'does not' or 'doesn't'. The original sentence 'He don't come' incorrectly uses 'don't' with a singular subject. 'He doesn't come' is the grammatically correct negative present tense form. 'He didn't come' is past tense, and 'He won't come' is future.

Both 'I am not able to' and 'I am unable to' are grammatically correct ways to express inability. 'Unable' is the direct negative of 'able', while 'not able' uses the negation. Options C and D incorrectly use 'able' with 'didn't' and 'won't' - it should be 'wasn't able to' and 'won't be able to'.

With 'neither/nor', the verb agrees with the subject closest to it. Here, 'I' is closest, so we need 'was' (first person singular). Also, 'neither/nor' is the correct correlative conjunction pair, not 'neither/or'.

The question 'Why don't he come to work in time?' has two errors. First, with 'he', we should use 'doesn't', not 'don't'. Second, in questions about habitual actions, we typically use present tense with 'do' - 'Why doesn't he come' is correct for present habitual, or 'Why didn't he come' for past specific.

The sentence 'I did not talk to the customer' is grammatically correct. 'Did not talked' would be wrong because after the auxiliary 'did', we use the base form of the verb. The sentence correctly uses simple past tense negation.

Option C 'Will you have finished' is correct. 'By this time tomorrow' indicates a future deadline, requiring the future perfect tense ('will have + past participle'). This structure describes an action that will be completed before a specific future time. Options A and B use future simple, which doesn't convey completion by the deadline. Option D 'shall' is grammatically incorrect in this context.

Option A is correct because it uses a colon to properly introduce the explanatory clause 'Leave for London while you can.' The colon connects the main clause to its explanation. Option B lacks the necessary colon, creating a run-on. Option C incorrectly uses a period, making 'Leave for London while you can.' a sentence fragment.

The phrase 'a talented man in the world of business' is an appositive that provides extra information about James. Appositives must be set off by commas on both sides when they appear in the middle of a sentence.

Options A and D are correct because they use hyphens properly in compound adjectives. 'Off-the-peg' and 'made-to-measure' are compound adjectives modifying nouns, so they take hyphens. Option B is incorrect because 'off-the-peg' is used as an adverbial phrase here (not modifying 'jacket'), and should not be hyphenated. Option C misuses 'made-to-measure' as a verb phrase when it should be a compound adjective.