"être" is to be, you use it the same way you use 'I am' 'you are' 'he/she is' am, are, is are all variations of the form 'to be' in english. if you look at it in bahasa indonesia, the equivalent of the 'etre' meaning is embedded when you say "saya seorang dokter" because seorang kind of means 'a/an' but saya is the equivalent of (me+ to be) __(something)__ in french however, it is broken down and you have to input the subject (je, tu, il/elle/on, vous, nous, ils/elles) before a conjugated version of "etre" in a sentence. (note that unlike in BI/English, occupations in French do not have an 'a' in front of the title. for example, je suis medecin (literally, I am doctor/saya dokter) avoir however usually means to have, like 'ada' in BI. so you use it the same way, saya ada... dia ada, etc.