In
the sentence, there are compound verbs – ‘had’ and ‘were’
Sentence structures could be simple (one independent clause), compound (two
independent clause with coordinating conjunction), complex (a subordinate &
independent clause) and compound-complex sentences (subordinate & two
independent clause). These include clauses, conjunctions, coherence and balance
and even to the number of words you use in your subject and predicate. You must
also see to it that when you do parallelism, your sentences still makes sense.
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You can observe how challenging institutes are by taking surveys and then see how difficult summer programs are to students. Compare and contrast your results to see what you get.