• The verb 'know' is a stative verb, which generally does not take continuous forms.
• The phrase 'since 2010' indicates an action that started in the past and continues up to the present.
• For stative verbs with a time expression indicating duration from the past to the present, the Present Perfect Tense is used.
• The structure for Present Perfect Tense is Subject + have/has + V3 (past participle).
• Therefore, 'have known' is the correct form.
• This sentence describes an action ('sleeping') that continued for a period of time ('for two hours') in the past, up until another past action ('I called her').
• When an action continued for a duration in the past before another past action, the Past Perfect Continuous Tense is used.
• The structure for Past Perfect Continuous Tense is Subject + had been + V1-ing.
• Therefore, 'had been sleeping' is the correct form.
• This sentence states a universal truth or a scientific fact.
• Universal truths, general facts, and habitual actions are expressed in the Present Indefinite (Simple Present) Tense.
• The structure for Present Indefinite Tense is Subject + V1 (base form of the verb), with 's/es' added for a third-person singular subject.
• 'Water' is a third-person singular subject, so 'boils' is the correct form.
EnglishTenseTenseQ. #5853 (CAT-I)
When I arrived at the station, the train ______ already.
• This sentence describes two past actions: 'arrived' and 'the train leaving'.
• When two actions occur in the past, the one that happened earlier is expressed in the Past Perfect Tense, and the later action in the Simple Past Tense.
• The train leaving happened before I arrived.
• The structure for Past Perfect Tense is Subject + had + V3 (past participle).
• Therefore, 'had left' is the correct form to indicate the action that occurred first.
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• The phrase 'just now' indicates an action that has been completed very recently, with its effect still relevant in the present.
• This situation is best expressed using the Present Perfect Tense.
• The structure for Present Perfect Tense is Subject + have/has + V3 (past participle).
• Therefore, 'has written' is the correct form.
EnglishSynonymsSynonymsQ. #5821 (CAT-I)
'Cheerful readiness, eagerness, or speed' describes 'Alacrity'. What is a suitable synonym?