1. God save us from the ninjas.
The imperative mood shows the activity is an urge (command, prohibition, request, advice).
imperial
empire
emperor
Lay your soul at my feet.
God save us from the ninjas.
Do keep nothing from the masters.

2. Most people have not developed the skill needed to see ninjas.
Usually using a declarative sentence or statement, the indicative mood shows the activity is a fact.
dic or dict = say
indicate
indication
Most people have not developed the skill needed to see ninjas.
Ninjas are always in the room with you.

3. sub = less, lower junct = join
The subjunctive mood shows the activity is not a fact (wishes, possibilities, doubts, suggestions, conditions, etc).
sub = less, lower
junct = join
Common Verbs: ask, demand, determine, insist, move, order, pray, prefer, recommend, regret, request, require, suggest, wish
I wish I were faster than the ninja.
It might rain ninjas from the sky.
You should listen to the ninja’s commands.
I doubt ninjas will forget your soul.
If he had run, he would have survived.

4. The conditional mood shows the activity is problematic or unreal
The conditional mood shows the activity is problematic or unreal. It sometimes feels like a cause and effect.
condition
If I should see any ninjas, I’ll tell the local lord.
May the ninjas live long and prosper.
If I were you, I wouldn’t make the ninjas angry.
If we had told the ninja where our jewels were, they still would not have left us alive.

5. How are we going to escape the stealthy ninjas?
The interrogative mood shows the activity in a state of questioning. It often inverts the order of subjects and verbs.
rog = question
interrogate
How are we going to escape the stealthy ninjas?
Will we ever keep the ninjas out of our homes?