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Present perfect: have/has + past participle connects past experience with the present. Use ever/never for experience, already/yet for completion, for + duration and since + starting point. Do not normally combine present perfect with a finished past time such as yesterday; use past simple then.
/j/ begins yes and youth; keep the tongue high without blocking the air. /w/ begins we and workshop; round the lips then glide into the vowel. Do not confuse west and yes or add a separate vowel before the glide.