51. Prepositions of time: in, on, at

Use in for months/years/long periods, on for days/dates, and at for exact times.

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52. By for deadlines

Use by when something must happen no later than a specific time.

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53. For vs since

Use for with a period of time and since with the starting point.

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54. From...to

Use from and to to describe a range of time, place, or movement.

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55. Because for reason

Use because + clause to explain a reason.

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56. Because of + noun

Use because of + noun or noun phrase.

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57. So for result

Use so + clause to show a result.

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58. Although / though for contrast

Use although or though to connect contrasting ideas.

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59. But for contrast

Use but to connect two contrasting ideas.

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60. And for addition

Use and to add related information.

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