if you are a native speaker who is 100% SURE of the answers, the please fill in the gaps That's not how it works round here. First you answer the questions and then someone will correct the errors (if you make any).

This advice seems to be from a seventy-five-year-old textbook! No one but the most conservative prescriptive grammarian would say this today! Maybe the "can/could/may" thing in the USA has gone the same way as the "shall/will"

If you get on the London Metro (Tube) going from point A to point B, needing to change trains several times that is still known as a "single".

Did I understand you right: 'Shall I open the window?' equals 'Have I enough strengths to open the window?'. I guess not. "Shall I open the window?" means you are asking another person for their opinion. It has nothing to

how do you explain the tradition use of "In Jesus' name we pray, amen" with just the ' and not the 's? I always thought this was purely phonetic. If you can hear a double "s" sound then you write

We use past perfect for number two because it is no longer the case due to a past event (number three). These aren't just a bunch of things that happened in the past, they are interconnected.

In your sentences "can" and "could" are being used a substitutes for "may", i.e you are asking permission. "Shall" on the other hand is being used, not to ask permission, but to get another person's

Until today, I have been enjoying school in spite of the work You can't use present here. You need past perfect. Your sentence contradicts itself. "I have been" is used for a current state; "until today" is used when the

There weren't four temporal markers, there were three. Number 2 on my list is a state that prevailed between one and three, and that is no longer the case. When a state (number 2) is no longer current it is in the past and this is why the past

I know that the past perfect expresses an action which happened before another action or a point of time in the past.So in the sentence I originally posted, there are three distinct times: "the terrible thing happened" Past "you