alle zwei Stunden vs. jede zweite Stunde "The trains go every two hours." "Die Züge fahren alle zwei Stunden" is accepted as correct translation, while "Die Züge fahren jede zweite Stunde" is not. I know people say "jeden Zweiten Tag" and "alle zwei Tage" interchangeably, so this rule only applies to "Tag, Woche, Monat" but not "Stunde"?

projeter vs prévoir Hi, the English sentence is "You have to plan everything." My translation is "Tu dois tout projeter." And it's marked wrong. The correct answer is "Tu dois tout prévoir." Is there any difference between the two verbs? In the dictionary, both mean "plan".

J'ai voulu vs Je voulais Hi guys, the original sentence is "I wanted a round table but it wasn't available." My translation is "J'ai voulu une table ronde mais elle n'était pas disponible." (marked wrong) But the correct answer is "Je voulais une table ronde mais elle n'était pas disponible." Can anyone please explain the grammar to me, thanks!

"How were you able to live without a computer" translation Hi, this is an exercise question on duolingo, my answer is "Comment est-ce que tu pouvais vivre sans ordinateur ?". But it's marked wrong. The correct answer is "Comment tu pouvais vivre sans ordinateur ?". My questions are: 1. is my answer also acceptable? 2. Does the order of 'tu' & 'pouvais' matters here: "comment tu pouvais vivre" / "comment pouvais-tu vivre". I'm a rookie and I don't even know if my questions make sense, it'd be kind of you if you can try to explain, thanks :)

Is there any difference between 'matin' and 'le matin' ? Mardi matin, nous allons chez notre grand-mère. Le mardi matin, nous allons chez notre grand-mère. Are both of the sentences correct? If they are, would anyone be so kind as to tell me what the difference is?

Where should I put 'tout'? This is a sample sentence from Duolingo: J'apprends tout pour mes examens. But this is another one: Tu vas tout comprendre. My quetion is: Isn't it supposed to be ' Tu vas comprendre tout' ? Cheers!

au parc / dans le parc 'Ils se baladent dans le parc.' Is there any difference between 'au parc' and 'dans le parc'? Thanks!

Is there a difference between しても　いいですか and することが　できますか? ここで　写真を　とっても　いいですか。 ここで　写真を　とることが　できますか。 May I take a picture here? Are both of them correct?

Grammer Question: ... that are... .... it displays the maneuvers that are sent from the server. Hi, I want to know whether the sentence above is correct. I know if I replace "that" with "which", the sentence will be correct. Thx :)