tailieunhanh - Delta's key to the toefl test part 24

mỗi đơn vị sẽ mở ra với một tập thể dục để tập trung sự chú ý, kích hoạt kiến thức, và học sinh giúp dự đoán nội dung. Tập trung có một văn bản tiếng Anh-một cuộc trò chuyện senteflci, đọc đoạn văn, hoặc đoạn bài luận và những thách thức người học để xác định các nguyên tắc có liên quan. Những bài tập thể được thực hiện trong lớp học hoặc như bài tập ở nhà. | 2M ÄDVER Clauses and Phrases Adverb Clause When a substance undergoes a slow oxidation the substance can burst into flame. Adverb Phrase When undergoing a slow oxidation a substance can burst into flame. Adverb Clause Benjamin Franklin invented many things while he was working as a printer. Adverb Phrase Benjamin Franklin invented many things while working as a printer. To reduce an adverb clause to an adverb phrase omit the subject of the clause omit the auxiliary verbs if there are any change the verb to its -ing form Note Use the -ing form present participle when the adverb phrase is in the active voice. Use the -ed form past participle when the adverb phrase is in the passive voice See . These rules apply to verbs in any tense. Active Voice Frank Sprague developed the elevator after he had improved the electric motor. Frank Sprague developed the elevator after improving the electric motor. Passive Voice Since it was discovered penicillin has been used to treat bacterial infections. Since discovered penicillin has been used to treat bacterial infections. Note When reducing adverb clauses that begin with because when or while you can sometimes omit the subordinator as well as the subject. Adverb Clause Because it was once considered a dangerous predator the wolf has been hunted to near extinction. Adverb Phrase Once considered a dangerous predator the wolf has been hunted to near-extinction. Adverb Clause When she returned to her native city. Kate Chopin began to write the stories for which she is noted. Structure Delta s Key to the TOEFL Test 223 Apyers Clauses anp Phrases Adverb Phrase Returning to her native city. Kate Chopin began to write the stories for which she is noted. Note An adverb clause cannot be reduced if the adverb clause and main clause have different subjects. The following sentence cannot be reduced Wherever ornamental grasses are used the garden will have a finished look. 4. Some of the answer choices may try to trick you by having .

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