Rule2 :-
if+past tense, sub+would,could,might+verb in simple form :
বুজায় যাচ্ছে if clause past tense হলে পরের clauseএ would,could,might(have(past from) হয় ।
if we had a boat ,we would cross the river.
past tense এর পরিবর্তে be verb এর ক্ষেত্রে শুধুমাএ were use হয় । এক্ষেত্রে structure ঠিক থাকে ।
if i were you , i would handle the situation more carefully .
Example:-
-if she ate fewer sweets, she would lose weight.
-if i found a bad in the street, i would take it to the police
-it would be, if we kenw where to go.