Farsi · Pronunciation Guide
Say "KHAH-har", with a raspy "kh" (like the "ch" in Scottish "loch") and stress on the first syllable — the و in خواهر is silent, a spelling relic.
khāhar
Another member of the first-syllable-stress kinship group (with مادر, پدر, برادر, پسر, دختر); stress falls firmly on khā, not har.
Listen: خواهر
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خواهرم در لندن درس میخواند.
Khāharam dar London dars mikhānad.
My sister studies in London.
Listen: خواهرم در لندن درس میخواند.
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"خواهرم در لندن درس میخواند" ("My sister studies in London") uses درس خواندن literally "to read lessons", the standard Persian compound verb for "to study".
Two traps at once: learners either pronounce the silent و as a "w" sound (saying "khwā-har"), or they soften خ into a plain English "h". Neither is right — skip the "w" entirely, and give خ real rasp in the throat.