How to use “lack” properly？
How to use “lack” properly？As far as I know，“lack” is a verb and noun.The “teacher” just told us ：①（when it is a verb）：lack （for） sth. ②（when it is a noun）：（a）lack of sth ... for lack of
Can I write “ I lack of sth. ”when“ lack” is a verb ？Can I use ”of“ when it is a verb？whether I must write “I lack sth or I lack for sth“？
Can I say ：”I lack of time to study ？“ A British told me ：”you can say “ I lack of sth”. I was frightened：“Are you sure that I can use “of”？My high school teacher told me that I could not use ”of“ when lack is a verb.And then he was hesitant. I asked an American black person ，too.Even he wasnt sure that ”lack“ is a noun.I was frightened again.
Tonight a British told me ”no lack for“ .I was frightened again.
I want to know how to use “lack” properly？Could you please tell me?Thanks!

Question

How  to  use “lack”  properly？
How  to  use “lack”  properly？As  far as I know，“lack” is  a verb and noun.The “teacher” just told us ：①（when it is a verb）：lack （for） sth. ②（when it is a noun）：（a）lack of sth  ...           for lack of  
                   Can I write “ I lack of sth.  ”when“ lack” is a verb ？Can  I  use  ”of“  when  it is a  verb？whether I must write “I lack sth or  I   lack for sth“？
                Can  I  say  ：”I  lack  of time to study  ？“  A  British told  me ：”you can say “ I lack of sth”.  I  was  frightened：“Are you sure  that I can use “of”？My  high school teacher told me that I could  not  use ”of“  when  lack is a verb.And  then he was   hesitant.              I  asked an  American black person ，too.Even  he   wasnt  sure that  ”lack“  is  a  noun.I  was  frightened again.
                Tonight   a  British  told me ”no    lack  for“   .I was  frightened again.
                I want  to know  how  to  use “lack”  properly？Could  you  please  tell me?Thanks!

Answer

At least in America, "lack of" is only used when it's a noun. For example "There's a real lack of enthusiasm among the students."
When it's used as a verb, it's mostly used alone (without "for"). For example "You lack the necessary qualifications for this job." "For" can be used when it's a verb, however it's very formal. You find it a lot in old books. For example "He lacks for confidence when speaking to women." (I suspect this might also be the case with "lack of" as a verb, but I've never heard it or read it. So It must be extremely formal.)

Answer

You use "of" when lack is a noun. Just keep that rule in mind and you won't make that awkward mistake.

Also, don't worry about the speakers who were doubtful about the phrase - it just means they hadn't thought about it properly.

Answer

How to .... is not a question.  
Can someone tell me how to ...? - a question.
How do you use "lack" properly? - a question. 
oh,thank you!  And so  I   cannot write  "of" when lack is a verb  ."For" can be used when it's a verb, however it's very formal. You find it a lot in old books. For example "He lacks for confidence when speaking to wom

Answer

See Peachey's fine answer
“ I lack of something ”when“ lack” is a verb ？ - no
“I lack something" - yes
A British guy told me
“ I lack of sth”. - no
Tonight a British guy/person told me 
BTW: How to .... is not a question.
How to use "lack" properly is a mystery to me. - A statement.
Can someone tell me how to ...? - a question.
How do you use "lack" properly? - a question.

Answer

I agree with DR Hall. Usually we use "lack of" as a noun. 
 e.g There is a lack of parking space in town.
 If you want to use " lack" as a verb-  you can use the word alone.
e.g  They lacked the courage to fight back.

Personally, I can't remember ever using "lack for"  but I'm sure i have used " for lack of ..."  a lot.