the medicine has had no effect on me 这句话是完成时态吗?

this medicine has had no effect on the patient为什么要加 had,has no effect不行吗? the medicine has had no effect on me 这句话是完成时态吗? The medicine has side effect.为什么? The medicine he had taken ____ the blooda.has a bad effect on b.had a bad effect on为什么选B The patient has tried quite a few kinds of medicine,but ______ had any effect on his disease.A.none B.nothing C.neither D.no one The medicine has no____(效果）on this illness. She feels worse ,a_____she has had some medicine填什么（根据首字母a填） studies will be needed to see if the medicine has any effect on the disease. If he had taken the medicine,he _____(feel)better now 英语翻译he had to t______some medicine,but he couldn't find any water in the train and had get off. 帮我看看英语作文写的时态错了没有 还有语法Yestday,John had a bad cold ,he had a headache dan he had a fever ,Then he went to the hospital.docyot said you shuld lie down and rest.now John has to drink some water and take medicine on Has a doctor ever given you a note to take to the chemist for some medicine? after taking the medicine,his te- has gone down填什么 The medicine has a bitter t___.I don't want to take it. 改错1.Do exercises.Each line has a mistake.Find it out and correct it.2.In the past ,20000people lived in the Walled City.We had our own.3.Chinese medicine shops,dentists,a temple and some western restaurants.4.Now it has changed a lot.The place I the medicine should work He ________ the computer for half a year. A.has bought B.had bought C.has had D.had had Revise the following sentences.Try to make them concise.The substance,which was discovered almost by accident,had revolutionized medicine.