Директор вынужден изменить план.

In Russian, the verb to be is usually omitted in the present tense.

So:

• Директор вынужден изменить план. = The director is forced / has to change the plan.

Russian does not normally say a present-tense equivalent of is here.

Compare:

• Он студент. = He is a student.
• Она занята. = She is busy.

But in the past or future, forms of быть do appear:

• Директор был вынужден изменить план. = The director was forced to change the plan.
• Директор будет вынужден изменить план. = The director will be forced to change the plan.

Вынужден means forced, compelled, or having no choice but to.

In this sentence, it expresses necessity caused by circumstances, not moral duty.

So Директор вынужден изменить план means something like:

• The director is forced to change the plan
• The director has no choice but to change the plan

This is different from:

• должен = must / should / is supposed to
• нужно / надо = it is necessary

So:

• Директор должен изменить план = the director is expected or required to change the plan
• Директор вынужден изменить план = the situation leaves the director no real alternative

Because вынужден is actually a short-form adjective, not a finite verb.

It comes from вынужденный (forced), and the short form is used in predicate position:

• вынужден — masculine singular
• вынуждена — feminine singular
• вынуждено — neuter singular
• вынуждены — plural

Examples:

• Директор вынужден... — masculine
• Директор вынуждена... — if a female director is meant
• Они вынуждены... — they are forced to...

This structure is very common in Russian: [subject] + short-form adjective + infinitive

For example:

• Я готов помочь. = I am ready to help.
• Он обязан уйти. = He is obliged to leave.
• Мы вынуждены ждать. = We are forced to wait.

This is a question of aspect.

• изменить = perfective
• изменять = imperfective

Here, изменить is used because the sentence refers to a complete action: making a change to the plan.

So:

• изменить план = to change the plan (as a completed result)

If you used изменять, it would sound more like:

• changing in general
• changing repeatedly
• being in the process of changing

So the sentence focuses on the fact that the director must carry out a change, not on the ongoing process.

It is in a case: accusative.

The verb изменить takes a direct object, so plan must be in the accusative case.

For masculine inanimate nouns like план, the accusative singular is the same as the nominative singular:

• nominative: план
• accusative: план

So the form does not visibly change, but grammatically it is still accusative.

Compare with a feminine noun where the change is visible:

• изменить программу = to change the program

And with an animate masculine noun:

• видеть директора = to see the director
  Here accusative changes because the noun is animate.

Because директор is the subject of the sentence, and subjects are normally in the nominative case.

Here, the structure is:

• Директор — subject, nominative
• вынужден — predicate adjective
• изменить план — infinitive phrase explaining what he is forced to do

So the basic grammar is:

[Who?] + [is forced] + [to do what?]

That is why директор stays in the nominative.

Yes, but then the form вынужден would usually change to agree with the person’s gender.

If the director is female, you would typically say:

• Директор вынуждена изменить план.

This is because вынужден agrees in gender and number with the subject.

A useful point: job titles like директор are often grammatically masculine in Russian, even when referring to a woman. In that case, other agreeing words may show the real gender:

• Наш директор вынуждена изменить план.

That may look surprising to English speakers, but it is normal Russian usage.

No, Russian word order is fairly flexible, but the given order is the most neutral one.

Neutral order:

• Директор вынужден изменить план.

This simply presents the information in a straightforward way.

Other orders are possible for emphasis:

• План директор вынужден изменить.
  Emphasizes the plan
• Изменить план директор вынужден.
  Emphasizes the fact of having to change it

So word order in Russian often reflects focus, contrast, or style, not just grammar.

The stress is:

• дирЕктор
• вЫнужден
• изменИть
• плАн

So you can mark the sentence like this:

дирЕктор вЫнужден изменИть плАн

Approximate pronunciation:

• директор — dee-RYEK-tər
• вынужден — VIN-zhden or VYN-zhden depending on how narrowly you describe it
• изменить — eez-myeh-NEET’
• план — plahn

A learner should especially remember the stress in изменить, because Russian stress is unpredictable and important.

This is an important difference.

вынужден

Means the person is forced by circumstances.

• Директор вынужден изменить план.
  The situation leaves the director no choice.

должен

Means duty, obligation, expectation, or necessity.

• Директор должен изменить план.
  The director is supposed to change the plan / must change the plan.

So:

• вынужден = external pressure, no real alternative
• должен = obligation, requirement, or expectation

English often translates both as must or has to, but in Russian the nuance is different.

It can often be translated as both, depending on context.

Possible natural English translations:

• The director is forced to change the plan.
• The director has to change the plan.
• The director has no choice but to change the plan.

However, вынужден is usually stronger than a simple has to. It suggests pressure from circumstances, not just a routine necessity.

So if you want to keep the Russian nuance clearly, is forced to or has no choice but to is often better.

You normally negate вынужден with не:

• Директор не вынужден изменить план.

This means:

• The director is not forced to change the plan.

In real usage, Russian speakers may also choose a different aspect in the infinitive depending on context, for example:

• Директор не вынужден менять план.

That can sound more natural in some situations, especially when talking about the necessity in general rather than one completed change.

So the main point is: не goes before вынужден.

Yes, very common.

изменить план simply means to change the plan.

Other similar combinations include:

• изменить решение — to change a decision
• изменить маршрут — to change the route
• изменить график — to change the schedule

So this is a very standard and useful phrase pattern: изменить + direct object.