Hi, as described in the video, we need a perfect infinitive when we use the Infiniti e to talk about the past. In this case we could use "to have driven" or "to have been driving". "To have been driving" (perfect continuous infinitive) works best here because we are talking about something that was in progress at a moment in the past (when the driver was detected / caught). Does that answer your question? Feel free to let me know if you need clarification.

I'm glad that you found it useful! Have you registered for one of our free courses yet? Just follow the link in the description!

Thanks, I'm glad that you found it useful. If you enjoyed this lesson, you should register for our free course, just follow the link in the description!

No mistake at all, that sounds fine to me. Adding the agent (the police) is optional but perfectly normal. Feel free to ask if you have any other doubts.

Yes, both of these are correct 👍🏻

I'll add these suggestions to my "to do" list. Thanks.

Hi! These are really similar and can usually be used interchangeably. However, there is a difference. Should is used to make a recommendation. Supposed to is used to explain what is expected of someone. What is recommended and what is expected are often the same, but certainly not always.

Thanks, glad that you liked it. Have you signed up for our free courses yet? onlearn.es/product/upper-intermediate-english-grammar-course-b2-c1

I'm glad that you found it useful. Don't gorget that you can join our interactive courses for free! onlearn.es/product/upper-intermediate-english-grammar-course-b2-c1

Hi, "the police are investigating" is standard. It is not standard to say "the police is investigating". This is quite an unusual mistake. What book is it that uses "police is"?

Thanks, glad that you found it useful!

Hi! The verb "to have" is an auxiliary verb, just like you use in the present perfect ("I have eaten"). When we need to use an infinitive verb form that refers to the past we use the perfect infinitive, which is "to have" + past participle. Does that answer your question?

Hi! Good question. In American English, "family" is almost always a singular noun. In British English, it can be a singular or plural noun. So, in answer to your question, both "believe" and "believes" work here.

Hi! We're very happy that you found the video useful!

I'm really glad that you found the video useful. New videos are coming, make sure to subscribe to get updates. Check out all of the free interactive material and courses here: onlearn.es/all-courses

Like "He must have been waiting" or "she could have been lying"? This is a good suggestion, thanks.

I don't think that either Charles or Camilla are as popular as Diana was. However, I anticipate that the coronation will be watched by a lot of people. Thanks for commenting. If you found this exercise useful, feel free to subscribe for more!