Certainly, it is not a conjunction. there is not such an usage like this in english. it is a relative pronoun and relative clause. Yes here when ican be also put instead of that.

we learnt that when is used for the action verbs and while is for continuous verbs. but sometimes we can see the continuous tenses with when in subordinate clause.

in past tenses there is a controversial discussion on when while. I would like to learn something on past tenses concerning when/while. I wonder Is there a vital grammar rule on these past tense combinations ?

where did you take or see this usage from ? Can you show us the link ? It is subject pronouns which / who / that

Especially in 5 and 6 sentences, the usage of more than an hour equals more than one hour. I suppose there is no difference between them.

Dear CJ in the below post you wrote, that example ,I think , is relative clause. it is not a time clauses. Will you tell me (the time) when you will arrive in Narita? Tell me the time that you expect to arrive (later) in Narita. Tell me now what

but in that sentence the sentence starting with if should be noun clause. I doubt is main clause the second part if he will come..is noun clause. we could be careful at this point.

that is a right subject. in this forum like other forums also, there has been serious discussions and several ideas as to will in time clauses. Sometimes even if it is rarely visible, I saw will future tense in subordinate clause in time clauses.

1---- a master degree in the field of macroeconomics and development management 2-- I could not find out that meaning of the sentence. I suppose there must be a relative pronoun the financial situation increasingly difficult for my parents does