Since.si
Master English time words: since, for, ago, and the perfect tenses
Since, for, ago, already, yet - English time markers trip up even advanced learners. Get clear explanations, real examples, and instant answers on tense and time-expression grammar from a coach built for ESL learners and grammar enthusiasts alike.
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Tense diagnostics
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Time & Tense Reference
Core concepts for mastering English time expressions.
Core Time Markers
- Since — Marks the starting point of a continuing action or state, used with present perfect.
- For — Marks a duration of time, used with present perfect or past simple.
- Ago — Marks a point in the past measured back from now, used with past simple.
- By — Marks a deadline - something completed at or before a point in time.
- Until — Marks an endpoint, often with continuous actions up to that moment.
Tense Patterns
- Present Perfect — Connects past action to the present moment: have/has plus past participle.
- Past Simple — A completed action at a specific past time.
- Present Perfect Continuous — Emphasizes the ongoing nature of an action started in the past.
- Future Perfect — An action that will be completed before a future point in time.
Common Mistakes
- Since vs For — Since marks a starting point; for marks a duration - the most common ESL mix-up.
- Ago vs Before — Ago counts back from now; before compares two past points.
- Present Perfect vs Past Simple — Use present perfect when the past connects to now; past simple when it does not.
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