Use of present perfect in american english file,natural digestive enzymes in foods,probiotics help with candida - Downloads 2016

The present perfect tense is a rather important tense in English, but it gives speakers of some languages a difficult time.
We use Present Perfect Tense when we are talking about activities which happened in the past but their results are visible now. When we are talking about activities which have happened a specific number of times within pre-present period of time e.g. The present perfect tense is one way to talk about the past and it's a challenge to learn because it has several functions.

Examples of unspecified time expressions that use the present perfect include ever, never, once, many times, several times, before, so far, already, yet, etc.
Present perfect continuous - a mind map - created and sent by Agnès Pihuit Imbert (Ac.
This is a state that started in the past and continues in the present (and will probably continue into the future). The key is to associate the present perfect with unspecified time; it is NOT used to describe a specific event.

When you use specific time expressions (yesterday, last year, when I was a child, when I lived in London, etc.) you must use the simple past.

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