In the past, when students did a university degree, they tended to study in their own country. Nowadays, they have more opportunity to study abroad. What are the advantages and disadvantages of this development
The noun phrase essay seems to be missing a determiner before it. Consider adding an article.
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Use a variety of complex and simple sentences
You should use complex sentences in your writing, but it does not mean that you should try to make all of our sentences complex.
‘Complex’ sentences are not actually very complex; they are just two or more simple sentences put together. Putting them together makes the essay more coherent and cohesive.