Dại tư và trang tư nen ket. Practice 1: Xác định và ngắt câu bằng mệnh dề tính từ. Bước 1 Gạch dưới mệnh đề tính từ hoặc các mệnh đề trong môi câu. (Một số câu có hai.) Bước 2 Trong khoảng trống bên cạnh câu viết R cho mệnh đề xác định và NR cho mệnh đề không xác định. Bước 3 Thêm dấu phây vào mệnh đề không xác định. 1. Families whose incomes are below a certain level pay no income tax. 2. My family, whose income is more than 50,000 pays about 25 percent income tax. 3. The sun which in 40 minutes can produce enough solar energy to meet humankind's needs for a year is one of Earth's potential sources of power. 4. We are at the beginning of a medical computer revolution, according to an article that appeared in Time magazine 5. A medical computer is a machine that analyzes the results of laboratory tests and electrocardiograms. 6. A physician who feeds a patient's symptoms into a computer receives a list of diseases that fit the symptoms of that patient. 7. Laser beams which are useful in both medicine and industry were first predicted in science fiction stories 75 years ago. The nametes that ha the hinkent a in the IImitad Cintan whiah thind

This exercise is about marking non-restrictive relative clauses in sentences. Non-restrictive relative clauses are clauses that provide additional information about a noun but are not essential to understanding the main point of the sentence. They are usually set off by commas and can be removed without changing the meaning of the sentence. In this exercise, we are asked to mark these clauses with parentheses. Here is the analysis sentence:1. "Families whose incomes are below a certain level pay no income tax." - The clause "whose incomes are below a certain level" is a restrictive clause because it specifies which families are being talked about. It is essential to the meaning of the sentence.2. "My family, whose income is more than $50,000, pays about 25 percent income tax." - The clause "whose income is more than $50,000" is a non-restrictive clause because it provides additional information about "my family" but is not essential to the main point of the sentence. The sentence would still make sense without this clause.3. "The sun, which in 40 minutes can produce enough solar energy to meet humankind's needs for a year, is one of Earth's potential sources of power." - The clause "which in 40 minutes can produce enough solar energy to meet humankind's needs for a year" is a non-restrictive clause because it provides additional information about "the sun" but is not essential to the main point of the sentence.4. "We are at the beginning of a medical computer revolution, according to an article that appeared in Time magazine." - The clause "according to an article that appeared in Time magazine" is a non-restrictive clause because it provides additional information about the revolution but is not essential to the main point of the sentence.5. "A medical computer is a machine that analyzes the results of laboratory tests and electrocardiograms." - The clause "that analyzes the results of laboratory tests and electrocardiograms" is a restrictive clause because it specifies what a medical computer does. It is essential to the meaning of the sentence.6. "A physician who feeds a patient's symptoms into a computer receives a list of diseases that fit the symptoms of that patient." - The clause "who feeds a patient's symptoms into a computer" is a restrictive clause because it specifies which physician is being talked about. It is essential to the meaning of the sentence.7. "Laser beams, which are useful in both medicine and industry, were first predicted in science fiction stories 75 years ago." - The clause "which are useful in both medicine and industry" is a non-restrictive clause because it provides additional information about "laser beams" but is not essential to the main point of the sentence.