What's the difficuties when you learn English?

English learning is not a easy work, we may meet a lot of difficulties. Firstly, in the aspect of listening ability, when we are taking to foreigners, it is easy to miss listen some words. Secondly, in the aspect of vocabulary, since our vocabulary is limited, we may not able to express our ideas clearly sometimes. Thirdly, in the aspect of frequency, since our practice is not enough, so our oral English is not frequent enough when we are talking. Moreover, in the aspect of pronunciation, if we are lack of practice, we are not able to pronounce the English words correct, then the other people may not understand our meaning. Lastly, in the aspect of grammar, the difficult we may meet is that we do not know which tense should use in what kind of situation: for example, it is really easy for us to mix the past tense and present perfect tense together. As a whole, we may meet a lot of difficulties when we are learning English.
PS: 我随便写了一下,不知道符不符合你的要求.因为你说要求是100字就可以了,但又要包括5个方面,所以各个方面似乎要写得非常简明扼要.我写得可能还是太长了点.但希望对你有所帮助.