Abstract

There are so many people who helped me complete this thesis, it becomes nearly impossible for me to enlist everyone’s name and contributions in a single paragraph. Special thanks to my family, specially my mom and dad and my elder brother Rajib, for being part of every bit of my life: their endless motivations, constant mental support and unconditional love were instrumental in whatever I have achieved so far. I still remember, every time I gave them a phone call out of frustrations and bruised state-of-the-mind, their only reply to me was: “There is always a next time, son, your good days are just ahead”. They truly are the part and parcel of my good and bad days. There is no doubt my advisor, Dr. Vincent Ng, comes right next. I would always be grateful for his insightful advices, encouragements and guidance needed to cross the final hurdles. He gave me the independence to pursue my own research, and at the same time provided ideas and support, whenever needed. I still remember the night, when I was writing the paper on the submission date of the NAACL and Dr Ng. was with me all night helping with the writing and inserting all the missing “the”-s in between, and still found some time after the submission (at 5 am in the morning) to discuss what I could have done better and

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