Grammar

The verb "find" is an irregular verb. Its past tense and past participle form is "found".

English grammar traditionally recognizes 8 parts of speech (noun, pronoun, verb, adjective, adverb, preposition, conjunction, interjection), and standard competition swimming pools have 8 lanes. The number 8 connects these two domains.

The verb 'found' (meaning to establish) forms its past tense as 'founded'. Example: 'They founded the company in 1990.' This is a regular verb formation.

The past tense of 'find' is 'found'. This irregular verb follows patterns like bind-bound and grind-ground. Example: 'Yesterday, I found my lost wallet.'

Modal verbs like 'must' are defective verbs that do not have past tense forms. To express past obligation, use 'had to' instead, as 'musted' is not a valid English word form.

The verb 'think' can be used in continuous tenses when expressing active mental processes (e.g., 'I'm thinking about what to do'). It's only non-continuous when expressing an opinion (e.g., 'I think you're right').

This is a humorous riddle playing on the grammatical exercise. The teacher asks Ramu to convert 'David killed a person' to future tense, but the joke answer 'David will go to Jail' anticipates the consequence of killing rather than grammatical conversion. The grammatically correct future tense would be 'David will kill a person' or 'David is going to kill a person' (options A, B, C are grammatically incorrect anyway). This tests wordplay and humor rather than grammar.

The correct answer is C because 'advice' is a noun - it names something (guidance, recommendations). Nouns can serve as subjects, objects, or complements in sentences. Option A is incorrect because advice is not an action, option B is wrong because it doesn't describe a noun, and option D is incorrect because it doesn't modify a verb.

The correct answer is D because 'advised' is a verb - it describes an action (the act of giving advice or warning). In the sentence, 'advised' tells what was done to the speaker. Option A is incorrect because it doesn't replace a noun, option B is wrong because it's not naming anything, and option C is incorrect because it's not describing a noun.

In this sentence, 'practice' refers to a business or profession (the dentist's business), which is a noun. Practice as a noun means a habitual action or a professional business. Verbs would be 'practises' or 'practicing'.

In this sentence, 'practise' is what you must DO - an action, which makes it a verb. The sentence instructs you to perform the action of practising. Nouns are things; verbs are actions.

Options A and C contain tense inconsistencies. A: 'Raj wanted to visit his grandma, but cannot find' mixes past tense 'wanted' with present 'cannot', should be 'could not find'. C: 'They left the house around ten, walked to town and end up' mixes past 'left/walked' with present 'end up', should be 'ended up'. Options B and D maintain consistent tense throughout.

Option B incorrectly mixes present tense 'leaves' with past tense 'did not arrive' in the same sentence, creating a timeline contradiction. Option D wrongly uses present continuous 'are walking' alongside past tense 'happened', breaking the narrative flow. Options A and C maintain consistent tense usage within their clauses.

Correct. The present continuous tense is used to talk about pre-planned future events.