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I/you/we/they have something now, at this moment He/she has something now. I/you/he/she/we/they had someting in the past (e.g. yesterday).
The present tense expresses something that is happening now whilst the past tense expresses something that has already happened.
The present tense expresses something that is happening now whilst the past tense expresses something that has already happened.
Could be near past or distant past. Past simple tells about something at a definite time in the past, something that is now finished. I had breakfast at 7:30. (its now 8:30) She went to China in 1992.
The present tense expresses something that is happening now whilst the past tense expresses something that has already happened.
"Now" is used to express something that is happening at the present moment.
The latter, "Have not registered" is correct.To use it in a sentence see the following:I have not registered yet, can I do so now?It does not sound right to say:I have not register yet, can I do so now?Register is something that you do in the present, called present tense.Have is a used to describe something you did in the past, called past tense.Registered is something is something you did in the past, also past tense.It is correct in a sentence to use the same tenses, and usually incorrect to use past and present tense about the same subject.
A past simple sentence has one verb in the past tense: I walked to school. -- The verb walk is in the past tense = walked. Past simple is used to talk about something that happened in the past and is now finished.
The past tense is when you write or speak about something that happened in the past or before present (now). So if you were to say I WENT to the shop, the WENT indicates that it happened before now however if you said i am going to the shop, am going indicates that it is happening now which is the present tense.
The past tense refers to something that has already happened. e.g. I danced. The present tense refers to something that is happening now. e.g. I dance. The future tense refers to something that will happen later. e.g. I will dance.
The past continuous tense is a verb for an action or event in a time before now, which began in the past and is still going on at the time of something interrupting.Example: I was laughing when I spilled the tea.
appeared is the past tense of appear. Appeared is used in the past simple tense which you use when you want to talk about something that happened in the past and is now finished. egThe dolphins appeared just before sunset.have/has appeared is called present perfect tense. This tense is used when you are talking about something that happened in the past and it continues now in the present (or it is important now).The dolphins have appeared just before sunset everyday this week.