Be – ser/estar
(Pronounced sehr/ehs-tahr)
To remember that be is pronounced sehr or ehs-tahr (ser/estar) in Spanish, use the following mnemonic:
I wish you would be serious (ser), especially here Tarzan (estar).

Examples of ser/estar (be) in a sentence
El café tiene que estar caliente.
(The coffee has to be hot.)
Tienes que ser paciente con los niños.
(You have to be patient with children.)
La reunión tiene que ser a las tres.
(The meeting has to be at three o'clock.)