If I had seen him - (তার সাথে আমার দেখা হলে তাকে বিষয়টি বলতে পারতাম)
'If I had seen him' (Past Perfect) থাকায় main clause এ 'I might have told him the matter' (modal + have + past participle) বসবে।
Related Questions
'if the driver had been more careful' (Past Perfect) এর ফলাফলে 'the accident might not have occurred' (modal + have + past participle) বসবে।
If I had another pen' (Past Simple) থাকায় main clause এ 'could help' (could + base verb) বসবে।
'Had I been there' (Past Perfect এর ইনভার্সন) থাকায় main clause এ 'I would have supported him' (would + have + past participle) বসবে।
'I would have lent' (main clause) থাকায় 'if' clause এ Past Perfect 'had asked' বসবে।
জব সলুশন