What difficulties do I face in writing assignment 2?

One of the difficulties which I had faced in writing assignment 2 is unable to express what I wanted to said in my writing. For example, I wanted to say CCS technology is an expensive technology and building it require a lot of money to build it; therefore most developing countries are unable to afford to build such technology due to the high cost. Instead of coming to this point I keep beating around the bush till people is very confuse about what I am trying to express in the essay. Furthermore because I cannot express properly I will end up writing in broken English, or incomplete sentence which make my statement has no meaning in it. Due to that I make a lot of language mistake and grammar mistake in the sentence which I written. By reading more English books will help to improve on my English and by writing more essays will be able to improve on my confidence in writing in English. Another mistake which I will always make when writing an essay is the tense. Because in the past when we I was in secondary school most of the time when I write mine essay, my teacher will always tell me to use past tense as most of the thing that I am going to mention in the essay is a past event. Because I do not know when to use the right tenses so the only safe way is to use past tense all the way. By doing so tenses mistake will be greatly reduce in the essay. The solution to solve such problem is to do more tenses exercise to make myself aware when to use the correct tenses. Hope that before examination of EG1471 I have already greatly improved on the difficulties which I had faced.