Is it correct to use present tense for the verb "notice" when talking abt sth in the past? I read an example as follows on a sentence structure book but I wonder why the verb "notice" is in present tense instead of past tense or present perfect .... The sentence , "I notice that he has taken your umbrella by mistake. " Under what situations can we use present tense this way? I can understand other examples like "She remembers that she has seen the stranger before.", or "The article says that many people were killed in the earthquake." But have difficulty in understanding the above example of "notice".... Thank you very much !

Only "champion" can be said as "winning" the competitions? I'm doing a comprehension exercise right now. There's a poster about a pianist. The poster mentions that the pianist has been : 1) the winner in 2011 London International Festival 2) the first runner up in 2012 All-Asia Piano Competition 3) the champion in 2014 Vienna Piano Competition then there's question asking , "How many competitions has she won?" I'm wondering whether I should answer 2 or 3 since I'm not sure if I should count the "first runner up" as winning too? (I've googled but it's not clear as there're also some phrases like " has won many titles ....". So if in general speaking, like the question mentioned above, how to define or use the phrase " winning a competition" ? Thank you so much for your help!

arrive on the scene ? arrive at the scene? "The police arrived on the scene of the crime. They arrived upon the scene of a frightening accident. What did they do when they arrived at the scene?" (an example from an online free idiom dictionary) I am confused of their usages, are they (arrive on the scene / arrive at the scene) meaning the same thing? Thank you very much!

enjoys or enjoyed? What should I use , enjoys or enjoyed, in the following context? "He told me he also enjoys/enjoyed working with computer." (talking about his present interest) Is it even possible to use present tense in an indirect speech? Thank you so much!

on the scene or at the scene? 1) What's the difference between them? 2) What should I use, on or at, in the following statement? When a fire broke out at the restaurant on Pine Road, I was ............. the scene. Thank you very much!

Are these questions all the same in meaning? 1) Does your father have a time machine? (present tense) 2) Has your father got a time machine? (looks like present prefect tense but means the same as Q1?) 3) Has your father a time machine? (is it correct grammatically?) Thank you very much.