这些题目主要涵盖了初中英语中的动词时态，包括一般现在时、现在进行时、一般过去时、一般将来时、现在完成时以及与时间状语相关的时态应用。下面是对每部分题目涉及知识点的详细解释：
A 部分：
1. He goes swimming in the river every day in summer. (一般现在时，表示习惯性动作)
2. It seems that you are right. (一般现在时，"It seems + 宾语从句"结构)
3. Look, the children are playing basketball on the playground. (现在进行时，表示正在进行的动作)
4. He was listening to the radio when I came in. (过去进行时，表示过去某个时刻正在发生的动作)
5. It is very cold. I think it is raining. (现在进行时，表示此时正在发生的事情)
6. I will bring some for you. (一般将来时，表示将要发生的动作)
7. Who took it? (一般过去时，询问过去的动作)
8. He said that he would come back in five minutes. (过去将来时，表示在过去看将来的动作)
9. He had left when I got there. (过去完成时，表示在另一个过去动作之前已完成的动作)
10. I lost my bike, so I have to walk to school. (一般过去时，陈述过去的事实)
B 部分：
1. He sat down and began to read his newspaper. (一般过去时)
2. He hasn't eaten anything for three days. (现在完成时，表示持续到现在的动作)
3. I will go with you if I have time. (一般将来时)
4. We will go to the cinema if it is fine. (一般现在时，条件状语从句用一般现在时表将来)
5. I will tell her the news when she comes to see me next week. (一般现在时，时间状语从句)
6. "When did you buy the car?" "In 1998." (一般过去时，特殊疑问句)
7. We have been good friends since we met at school. (现在完成时，表示持续到现在的时间)
8. What were you doing at five yesterday afternoon? (过去进行时，询问过去的特定时间点正在做什么)
9. How much did it cost? (一般过去时，询问过去的价钱)
10. What was he watching at this time last night? (过去进行时，询问过去的特定时间点正在做什么)
C 部分：
这部分是选择题，考察的是不同时间状语下的时态选用：
1. We’ll go swimming if the weather is fine tomorrow. (主句用一般将来时，条件状语从句用一般现在时)
2. It has been five years since he has left for Beijing. (现在完成时，since引导的时间状语)
3. Please don’t leave the office until your friend comes back. (主句祈使句，until引导的时间状语从句用一般现在时)
4. By the end of last year, he had learned about 1500 English words. (过去完成时，by+过去时间点)
5. Listen! Someone is crying in the next room. (现在进行时，表示此时正在发生的动作)
6. You must tell him the news as soon as you see him. (主句用祈使句，时间状语从句用一般现在时)
7. He told me that he would come to see us the next day. (宾语从句，主句一般过去时，从句根据需要调整时态)
8. We can’t find him anywhere. Perhaps he has come home. (现在完成时，表示对现在有影响的过去动作)
9. 和10. 同理，选择题未给出完整选项，但可推测为一般过去时或现在完成时。
通过这些题目，学生可以复习并巩固英语中的不同时态及其用法，理解并掌握如何在不同情境下正确运用各种时态。
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