I make sentence but can't speak English fluently because I become nervous during conservation.

Don't be nervous..be positive and be confident forever..you need much more practice to be fluent in English. It takes some time to get fluency. So all that you need is practice and confidence. Talk yourself in front of a mirror so that it may boost up ur confident level..when there is a clarity in your thought, definitely there would be a clarity in ur speech. Always be strong when you make a conversation with your friends.. Anyway I wish you all the best for ur English.. : )

yes , it is a big reason that we can't speak english fluent though we understand english

same case is with me, we need to practice daily brother....in front of a mirror & we can also talk with our family members.