The construction is redundant: "Could not" means the same as "not able to."
You might use the form "would not be able to" or simply "could not" or "cannot" which are all roughly the same with some connotations that vary by tense.
Note that "could not" is the past tense but also colloquially used to say "will not be able to" in the future. All of these mean that something "cannot" be done (impossible), but in many cases it is a choice not to act. You should correctly use "may not" when something is prohibited, or "will not" when it is your choice not to.
Either could work depending on how you use them. Talking with your dad means that you and your dad are having a conversation. Talking to your dad might mean that your the only one talking.
No, "Is she and you arrived at the airport on time" is not correct. It should be "Did she and you arrive at the airport on time?" or "Did she and you both arrive at the airport on time?" for proper subject-verb agreement.
It is not correct. The correct usage is: waiting to hear from you.
"Could you please wait just a moment?" - indicating a short amount of time "I just finished my homework." - indicating recent completion "I'm just trying to help." - indicating intention or emphasis
Technically, you could use retrospect as a verb, but it is not good usage. It would be better to say "I remember."
No, "Is she and you arrived at the airport on time" is not correct. It should be "Did she and you arrive at the airport on time?" or "Did she and you both arrive at the airport on time?" for proper subject-verb agreement.
The latter form is grammatically correct but the former is in popular usage.
"Two of them have sent" is correct usage.
"Could you please wait just a moment?" - indicating a short amount of time "I just finished my homework." - indicating recent completion "I'm just trying to help." - indicating intention or emphasis
As a consequence of his broken leg, he could not go on the skiing holiday.
Yes. You could also say, "Can you call her in a little bit?"
The correct usage is in Seventh Grade but to use this properly, you must out it in quotes. In "Seventh Grade" by Gary Soto,............
Either could work depending on how you use them. Talking with your dad means that you and your dad are having a conversation. Talking to your dad might mean that your the only one talking.
Both phrases are correct English usage but have slightly different connotations. "It's high time" suggests that something should have happened earlier or is long overdue, while "it's about time" simply implies that something should happen soon or has finally occurred.
Depending on what "it" is, "took it off the car" can be correct English usage.
It is not correct. The correct usage is: waiting to hear from you.
Yes it is correct.