was or were?
Hi, I am studying english but I am very bad at grammar. Please tell me when to use ”was” and when ”were” . is this a different tense or it”s the same tense but for different persons?

Question

Answer

For I/he/she.......was.
For you/we/they........were.

Answer

Check the Past Simple of verb "to be":
I was, You were, He/She/It was, We were, You were, They were.
Ex.: "I was glad to hear you were coming"
Sometimes you may find "were" as the subjunctive mood, expressing a wish or something improbable:
If I were, if you were, if he/she/it were...
Ex: "If I were you, I wouldn't let her go"

Answer

Moorche's answer is correct.
Using strict rules of English grammar, the conditional is different:
If I/he/she/you/we/they were...
However in spoken English, you would almost always hear:
if I/he/she was... 
If you/we/they were...
If you hear "If I were...", then you know for certain you are speaking to an English teacher.
[Ivan83 - I didn't see your contribution until I saved my message.  You describe the situation quite well.  I'm getting slow in my old age]

Não perca a oportunidade de aprender uma língua no conforto da sua casa. Navegue pela nossa seleção de professores de línguas experientes e inscreva-se na sua primeira aula agora mesmo!