Use regarding to name a topic, in terms of for one aspect, and as far as ... is concerned for one area.
Naming a topic or an aspect
Not "In terms of that the project is expensive, we should cut features." — say "In terms of cost, the project is expensive.". In terms of takes a noun, never a that-clause.
Try it: Hiroshi: Are we ready to start the fieldwork? Camila: ___ the funding is concerned, we're fine. Choose the words for the blank. (As far as / In terms of / Regarding) Answer: As far as — Only as far as closes with "is concerned": as far as the funding is concerned.
Word
Pronunciation
Example
regarding
/rɪˈɡɑrdɪŋ/
Regarding your question, we'll need more information before we can decide.
in terms of
/ɪn ˈtɜrmz əv/
In terms of cost, the project is far more expensive than we expected.
as far as ... is concerned
/æz fɑr æz ɪz kənˈsɜrnd/
As far as the budget is concerned, we still have some room to negotiate.
Formal ways to say 'about'
In formal writing, replace about with concerning, with regard to or with respect to, each followed by a noun.
Not "About your question, we need more information." — say "Regarding your question, we need more information.". About is correct English, but it is too casual for formal writing.
Try it: Camila: I started the email to the department with 'About the delay'. Hiroshi: Too casual. Write '___ the delay' instead. Choose the words for the blank. (With regard to / With regard of / As regard to) Answer: With regard to — The fixed phrase is with regard to + a noun: with regard to the delay.
Try it: Hiroshi: How should the funding report open? Camila: With the gap in the budget. Choose the opening line. (Concerning the funding gap, two options remain. / Concerning that the funding fell, two options remain. / Concerning to the funding gap, two options remain.) Answer: Concerning the funding gap, two options remain. — Concerning takes a noun phrase directly, not a that-clause and not "to".
Word
Pronunciation
Example
concerning
/kənˈsɜrnɪŋ/
Concerning the matter you raised, I've attached the full report.
with regard to
/wɪð rɪˈɡɑrd tu/
With regard to your request, a response will follow by Friday.
with respect to
/wɪð rɪˈspɛkt tu/
With respect to the proposal, the committee still has reservations.
What are the common mistakes?
Incorrect
Correct
Why
In terms of that the project is expensive, we should cut features.
In terms of cost, the project is expensive.
In terms of takes a noun, never a that-clause.
About your question, we need more information.
Regarding your question, we need more information.
About is correct English, but it is too casual for formal writing.