my old pen and my pen
She didn't have a nice pen. Notice how the main verb (have) is in the present tense, but the negator (didn't) is in the past tense - this shows us this is a past tense sentence,
Has is the present tense of possessing something. Had is the past tense of having at some point possessed something. He has a pen on his desk. He had a pen on his desk earlier.
I am putting the pen on the table.
yes but its past tense. also you could say he drew out a pen from his pocket
It depends on the tense. If it is future tense of it is something that is going to or should happen, then it would be A. If it was present tense (self-explanatory) then it would be B. If it was past tense or something that already happened, then it would be C or D.
Ummm... t e a c h e r guess. Or with a pen/pencil.
"Have you find" is not correct. "Had you found" is correct, along with "have you found", but their meanings are different: "Have you found" is in the present perfect tense, and "had you found" is in the past perfect tense. Examples: Have you found the answer yet? Have you found a dress to wear to your cousin's wedding? Had you found your notes in time to study for the exam? Had you found the illegal drugs before the police found them?
He didn't have a pen.
"To mark" is a regular verb, which means it has a regular past tense (add an -ed). "The little boy marked the wall with a black pen." As for participles, they are also regular: For the present, you add -ing. "I am marking page 2 of this proposal; please look it over." And for the past, you use the helping verb "have" (or "has" for a 3rd person singular subject)-- "I have marked page 2, so please read my corrections carefully." "Maria has marked page 2, and she hopes you will look at it."
You certainly can use a helping verb, but it depends on the tense. If it's a simple past tense, you don't need one: Who ate my sandwich? Who took my pen? But if you are using a past perfect tense, the helping verb is necessary, to show an action that happened earlier in the past: Who has seen this movie? Who has read the chapter? Other examples of interrogative sentences with who asking the question but no helping verb: Who is Alice? Who are you? Who was the one? Who has the answer?
A pen contains ink and a pencil has lead.
The POLAR Pen was Invented this past year 2013 by Andrew Gardner from INDIEDESIGN.