"The movie has not started yet."
はじまりません : It does not start. Declaring a present fact.
はじまっていません : It has not started. Declaring that a change of state has not taken place.
I hope that helps :)
I don't understand why はじまっていない/いません doesn't mean "is not starting", or why はじまらなかった/はじまりまえんでした "did not start [yet]" isn't correct.
I guess the confusing thing to me is that English "start" refers strictly to the state change [from not-happening to happening], not to the ongoing state of happening. So the present tense is only valid for that transitory period. That doesn't seem to be the case for はじまる?
It seems that 始まりません means "does not start" while "始まっていません" means "has not started". They are used in different contexts. 始まっていません has the ending of いません which is like "not being" (opposite of "to be") so it's about its current state.
はじまりませんでした: In the past, it did not start. This statement is unrelated to the present.
はじまっていません: In the past, it hadn't started. In the present it may still start.
Since it's hard to clearly articulate, I'll give an example in English as well.
Did the apocalypse happen? [It did not happen.] vs [It hasn't happened.] [-masendeshita] vs [-teimasen]
まだ can be at the beginning or in the middle, as long as it's clear which word it complements.
Can anyone tell me what's the difference between these two sentences?
Because according to google translate they mean the same thing.
映画はまだ始めていません does not translate to "the movie has not started yet."
The difference between 始めていません and 始まっていません is that the first one is a transitive verb (始める）and the second one is a intransitive verb (始まる). This means that 始める is used when something is starting something else and 始まる is used when something starts itself.
映画はまだ始めていません would translate to "(Subject) has not started the movie yet." 映画はまだ始まっていません translates to "the movie has not started yet."
You've got a subject particle が attached to the adverb まだ and おわりません "does not end" instead of はじまっていません "has not started"
It reads as "on the topic of the movie, the not yet, does not end"