The article analyzes the long sentences of scientific English in three respects: coordinate sentence , compound sentence, compound complex sentence and translate some sentences.

It is a difficult point in learning commercial English to correctly understand and translate the compound sentences in commercial English.

Hypotaxis and parataxis are grammatical features both in Russian and Chinese compound sentences.

The transformation of compound sentences and complex sentences in English;

Ellipsis in complex snetences of English, which mainly consists of attribute clause, object clause, adverbial clause, subject clausse, emphatic pattern and absolute construction of participles, is especially difficult for foreign learners, who should exert every effort to enhance the correct understanding of complex sentences with varied ellipses, in order to precisely express themselves.

Which" and"that" are two words frequently used in complex sentences.

It analyzes in deep the whole course of rules and methods of the same name variable quoting separately from four aspects that is parameter in shape and parameter in fact,memory space assign,compound statements,external variable and inside variable.

Compound sentences which do not connect with each other bwteen their clauses by connectives or conjunctions, but by meaning, intonation and so on, are compound sentences without connectives.

In English, complex sentences are a number of spe ec h language phenomena.

This paper is primarily concerned with the use of tenses and aspects in English complex sentences within the time reference framework, with its focus on the general tense and aspect rules, other factors affecting the use of tenses and aspects as well as operational tests.

In the part of analysis of the three translated versions of Harry Potter and the Deathly Hallows, the author tries to make a sufficient comparison between the original version and the translated versions concentrating on complex sentences and synonyms in view of macroscopical language.