English Grammar Basics

This proverb means don't criticize others for faults you have yourself - like glass being fragile to stones. Option A is about experiencing difficulty. Option B is about ordinary things, not hypocrisy.

Present simple tense is used for general truths and habits - the sun rising is a universal fact. Options A and D use incorrect verb forms. Option B is grammatically wrong.

Weather expressions require dummy 'it' as the subject. Options A and B are missing this required structure. Option D uses wrong tense - Siberia is still cold now.

'Weather' as a general concept takes 'the' - it's an uncountable noun being talked about generally. Options A and B use incorrect articles. Option C is grammatically wrong.

Infinitive of purpose 'to keep' explains why umbrellas are carried. Option A uses wrong structure. Option C is grammatically incorrect. Option D doesn't show purpose.

Present simple tense is used for habitual actions and general truths. 'It rains' correctly expresses a regular occurrence in the monsoon season. 'It raining' is grammatically incomplete, 'There rains' is incorrect syntax, and 'There raining' lacks a proper verb.

'Any' is used in negative sentences instead of 'some'. 'There isn't any grass' is the correct negative form. 'Some' is used in positive sentences, 'no' would make the sentence double-negative, and 'never' is an adverb not a quantifier.

Climate is a singular countable noun, so it requires an article. 'Have a warm climate' is grammatically correct. 'The warm' would imply a specific warm climate, 'warm' without an article is incorrect before a singular noun, and 'warming' is the wrong form.

Superlative adjectives require 'the' to specify uniqueness. 'The coldest season' correctly identifies winter in Northern Europe. 'Coldest' alone is incomplete, 'colder' is comparative not superlative, and 'cold' is positive degree.

'Most people' is the correct form when making a general statement about a majority of people. 'The most people' refers to a specific group, 'Most of' requires 'of the people', and 'Most is' is grammatically incorrect.

'Few' is used with countable nouns to indicate a small number. 'Few people can study abroad' means not many people have this opportunity. 'Less' and 'Little' are for uncountable nouns, and 'a few' means some (not a small number).

Past simple is used for completed actions at a specific time in the past. 'Reverted' correctly describes Hong Kong's return to China in 1997. 'Has reverted' would need a time reference, 'is reverting' is ongoing, and 'revert' lacks tense.

Past simple is used for the first action that happened before another past action. 'Won' correctly shows the completed action before receiving offers. 'Is winning' is present, 'has won' would focus on result, and 'was wins' is grammatically wrong.

Third conditional expresses unreal past situations. 'Had ended' + 'wouldn't have been' shows the imaginary scenario of the world ending in 2000. 'Have ended' is wrong tense, 'was ending' is past continuous, and 'is ended' is incorrect.

'Famous for both X and Y' is the correct structure to highlight two qualities. Warsaw is known both as Poland's capital and as a tourist destination. 'And' alone is weaker, 'or' changes meaning, and 'is' is grammatically incorrect.

'All over the world' is the correct idiomatic expression meaning 'everywhere in the world'. 'All in' and 'in all' are incorrect phrases, and 'all' alone needs 'over the world'.

Stative verbs like 'believe' are rarely used in continuous form. 'Many people believe' is correct. 'Is believing' and 'are believing' incorrectly use continuous aspect, and 'is believed' would mean he is believed by others (passive).

The correct preposition is 'in' to indicate location within the world. 'From' would indicate origin, 'of' would show possession, and 'was' is a verb not a preposition. The phrase 'in the world' is a standard prepositional phrase.

The correct answer is 'had to' because the sentence refers to past obligation. Modal verbs like 'must', 'can', and 'should' are never followed by 'to' in English - this is a common grammatical error. The past form of 'must' is 'had to'.

The correct verb is 'am' because 'I' requires the first person singular form of 'to be'. 'Is' is for third person singular, 'were' is for second person or plural subjunctive, and 'will' requires a base verb after it.