TAILIEUCHUNG - Luyện thi IELTS (p74)

Tham khảo tài liệu 'luyện thi ielts (p74)', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | abcasiapacihc com studyenglish .STUDY ENGLISH TRANSCRIPT EPISODE 14 JUNK DNA Hello. I m Margot Politis. Welcome to Study English IELTS preparation. Today we re going to look at conditional sentences . They re sentences that use if . If you listen carefully you ll be able to hear Dr Malcolm Simons talking about junk DNA the parts of DNA that people used to think were just rubbish. Listen to the different types of sentences he uses. Under Darwinistic notions you would think that junk would drop off under the theory of natural selection just like species drop off if they hit ecological niches which is incompatible with survival. If they can adapt to those niches then those that can survive and those that can t die is the notion. If you apply that to the DNA sequence then the coding region genes which survive have a function and by the way the non-coding sequences have survived as well. So the proposition would have to be that if they re there they ve got a function. In listening to Dr Simons you can hear that he uses a variety of sentences. This makes for much more interesting language. You should practice using sentences of different lengths and types especially complex sentences. Today we re going to look at one of the ways you can create complex sentences using an if clause . An if clause is a phrase that gives a condition that s necessary for something else to happen. They re often called conditional clauses . If means when provided that or on condition that. There are a few basic patterns for the if clause. Listen to this. If they can adapt to those niches then those that can survive and those that can t die. So the proposition would have to be that if they re there they ve got a function. If they can adapt then those that can survive. The pattern here is if simple present tense verb then . . Then introduces a clause describing the consequences. Look at the second example in the extract. If they are there they have got a function. I I ABC INSEARCHo TECHNOLOGY .

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