Past simple or present perfect? - English Grammar Today - uma referência à Gramática e uso do inglês escrito e falado - Cambridge Dictionary
Prepositions of time - here's a list of the time words that need 'on', 'in', 'at' and some that don't need any preposition. Be careful - many students of English use 'on' with months (it should be 'in'), or put a preposition before 'next' when we don't need one. at. times: at 8pm, at midnight, at 6:30. holiday periods: at Christmas, at Easter.
Time Expressions with the Past Perfect. Example: John does his homework. The class starts. By the time the class started, John had done his homework. The class started after John had done his homework. John had done his homework before the class started. John had already done his homework when the class started. The class started at 6pm.
Past simple or present perfect? - English Grammar Today -una referencia de la gramática del inglés hablado y escrito - Cambridge Dictionary
Past perfect continuous They had been walking for hours when they saw the house in the distance. She was worried because he hadn’t been sleeping well recently. We 'd been dancing for hours and we were tired. He had a headache because he 'd been studying since five o’clock in the morning. We form the past perfect continuous with: had + been
EnglishClub : Learn English : Grammar : Verbs : Tense : System : Tense and Time. It is important not to confuse the name of a verb tense with the way we use it to talk about time. A present tense does not always refer to present time (I hope it RAINS tomorrow). A past tense does not always refer to past time (If I HAD some money now, I could
csPCf.past perfect time expressions
