expressions
As stated in the title, I am in doubt between using "I want to thank" and "I would like to thank" to expresse acknowledgment for the supervisors and the committee members in a thesis.
I have used "I would like" at first, but when I checked it using Grammarly, It proposed to be changed to "I want to as": The phrase I would like may sound unconfident. Consider removing it or changing it to more direct language.
What is the more appropriate expression to use in this context?
It is impossible to answer this definitely without knowing a great deal more about the relationship between you and your interlocutor, but this may be what happened here:
You addressed him with a statement which is ordinarily used by children (and quite young children, at that) to adults they admire. In effect, you adopted the role of a child.
He took this to be intended as a jest, and “played up” to your initiative by assuming the role you assigned him: he responded as an adult (and a particularly elderly adult) would to a child, employing an indulgent and perhaps patronizing tone and the stock language of a stock 1930s or 1940s grandfather.
The word whippersnapper is particularly dated; I cannot believe it has been used otherwise than ironically since the early 1960s. I think for most Americans my age it is indelibly associated with Walter Brennan, the character actor who played the cranky but good-hearted Grampa Amos McCoy on the television program The Real McCoys (1957-63).
—Google Ngrams (which doesn't handle hyphenated words well, so I've used the unhyphenated spelling)
"The red colour" is a fairly rare expression, but it can be used. It answers the question "which of the colours?", selecting one from a set of colours that is somehow already known: maybe the colours on a chart, or some colours that have already been talked about.
"The colour red" is much more common, and refers to a colour (really, a range of colours) chosen from all possible colours.
[I'm using the British spelling for 'colour']
Best Answer
Both are acceptable. "I would like to thank" is slightly more polite, because it is a kind of "indirect" speech.
Grammarly flags this because (I assume) it is built on a particular style guide that emphasizes direct speech patterns. With expository writing, qualifications might sound "weak". For example:
Instead you should know whether or not it is true, and say so with confidence:
However confident, direct speech is not always the best option in every situation, especially when expressing humility and gratitude.