|Question:||What is the differents of that words?|
Indirect: "I wonder if it will rain today."
Direct: "Will it rain today?"
Indirect: "I wonder what time it is."
Direct: "What time is it?"
Indirect: "I wonder when they'll show up."
Direct: "When are they going to show up?"
So even in these sentences the word "wonder" is quite independent from "if" and the other adverbs. "I wonder" is the subject. "If it will rain" is the predicate.
In these cases "wonder" means to doubt, to think about something or speculate curiously. For example; to wonder about the origin of the universe.
"Wonder" can also be a noun for something surprising or exciting. As was said; "a wonder of the world". The adjective "wonderful" comes from this word, meaning something is amazing and "full of wonder".
Wonder in the context of an indirect question basically means the same thing as "curious"...
I wonder what's in a Wonderball.
I am curious as to what is in a Wonderball, the wonderful (as in full of wonder) chocolate treat.
The word has many uses and permutations, as you can see in this example of dialogue:
"I wonder why so many people vote Republican.(?)" (Curiously, this is both a statement and a question)
And I wonder why we can't get health care in America."
"There is no reason to wonder this, corporations have taken complete control of American politicians and they (politicians) cater to the healthcare and insurance industries rather than the American people."
"Well, then I guess it is no wonder after all."
"It would certainly be wonderful (as in great) if we could get health care in this country for more than just the rich."
"I wonder if it will ever happen..."