She's and he's take an S sound. they've, we've as well. So it's this V sound in the contracted form which refers to the have or has, ending as in the present perfect tense. so I've, I've.
I've been working in accounting or as an accountant for a few years, that's a good expression and that's the present perfect continuous tense and a perfect opportunity to use this tense.
Here are some time expressions used with the present perfect tense: today, this week, this year, in the last three months, in the last two years, recently, since 2010, since last autumn.
Now before I give you some more examples let's talk about when to use the past simple tense and the present perfect tense because this is often the confusing part about this tense.
To keep practising with the present perfect tenses, watch this playlist here because I've been making a few lessons about the present perfect recently.