Learn Farsi: یک سفیر باید در سفارت همیشه باادب باشد. - An ambassador must always be polite in the embassy.

It is built from the prefix bā- (with) and the noun adab (manners or politeness). It literally means "with manners". You can form its exact opposite, "impolite" or "rude", by using the privative prefix bi- (without) to create biadab.

Why does the sentence end with bāshad instead of ast?

The word bāyad (must) requires the verb that follows it to be in the subjunctive mood. While ast is the regular present tense for "is", bāshad is the subjunctive form of the verb "to be". You will always use bāshad instead of ast when expressing that someone "must be" something.

How should I pronounce the two 'a's together in baadab?

You pronounce both vowel sounds distinctly, with a tiny pause (called a glottal stop) between them: bā-adab. You do not blend them into one long sound because they belong to two separate parts of the word, the prefix and the root noun.

Are the words safir (ambassador) and sefārat (embassy) related?

Yes! Persian borrows many word-building patterns from Arabic. Both of these words share the same core root letters (s-f-r) which relate to travel and making journeys. Recognizing these shared letter patterns is a great way to link places and people in your vocabulary.