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When comparing two people, the comparative form 'more beautiful' is used.

The sentence refers to a past event ('last month'), so the past tense verb 'was' is required.

The subject 'They' is plural, and the future event 'next week' requires the present continuous form 'are' to express a planned future.

The phrase 'in the class' implies a comparison of one against all, requiring the superlative 'most'.

The subject 'It' is singular, requiring the singular verb 'is'.

The subject 'Leela' is singular, requiring the singular verb 'is'.

The sentence refers to a completed period in the past (till 1980), requiring the past tense verb 'was'. 'Is', 'are', and 'am' are present tense forms.

The indefinite article 'A' is used here to generalize about any single member of the class of politicians. 'An' is used before vowel sounds, and 'The' would imply a specific politician.

When using a proper noun to describe someone's qualities (e.g., he is like a Newton), the indefinite article 'a' is used to denote a person of that type. It functions as a common noun in this context.

The subject 'I' requires the first-person singular present tense verb 'am'. 'Is' is for third-person singular, and 'are' is for plural or second-person.

The subject 'He' is third-person singular, which requires the verb 'is'. 'Are' is for plural, and 'am' is for 'I'.

The subject is compound (Lakshmi and Nalini), which makes it plural. Therefore, the plural verb 'are' is required.

The definite article 'the' is used because Mumbai is the unique, specific capital of Maharashtra. There is only one capital city for the state.

The sentence describes the nature of the people. 'Needy' is the only adjective that logically describes a group of people in this context, whereas 'costly' and 'hilly' do not fit.

The word 'elephant' begins with a vowel sound, so the indefinite article 'an' must be used.