Oxford-Hachette French Dictionary
 
 I. how    [Brit haʊ, Am haʊ] ADV CONJ When  how is used as a question word meaning  in what way? or  by what means? (how did you get here?,  how will you do it?) it is almost always translated by  comment: comment es-tu arrivé ici?; comment le feras-tu? 
When  how is used as a conjunction meaning  the way in which it is often translated by  comment:  I don't know how they did it = je ne sais pas comment ils l'ont fait;  tell me how you make a curry = dis-moi comment on fait un curry. 
When  how is used as a conjunction meaning  that it is almost always translated by  que:  he told me how he had stolen the money = il m'a dit qu'il avait volé l'argent;  it's amazing how they survived = c'est étonnant qu'ils aient survécu. 
For more examples and particular usages see below.
1. how (in what way, by what means):
2. how (enquiring about success, health etc):
3. how (in number, quantity etc questions):
4. how (in exclamations):
5. how (in whichever way):
6. how (why):
II. how come ADV
IV. how's that ADV
1. how's that (what do you think?):
in the PONS Dictionary
 
 I. how [haʊ] ADV
1. how (in what way):
2. how (asking about condition):
3. how (exclamation):
II. how [haʊ] N
I. old <-er, -est> [əʊld, Am oʊld] ADJ
1. old (not young, new):
2. old (denoting an age):
I. much <more, most> [mʌtʃ] ADJ
II. much <more, most> [mʌtʃ] ADV
III. much <more, most> [mʌtʃ] PRON
I. many <more, most> [ˈmeni] ADJ
Phrases:
II. many <more, most> [ˈmeni] PRON
I. long1 [lɒŋ, Am lɑ:ŋ] ADJ
Phrases:
II. long1 [lɒŋ, Am lɑ:ŋ] ADV
1. long (a long time):
2. long (for the whole duration):
I. far <farther, farthest [or further, furthest]> [fɑ:ʳ, Am fɑ:r] ADV
1. far (a long distance):
2. far (distant in time):
3. far (in progress, degree):
4. far (much):
5. far (connecting adverbial phrase):
II. far <farther, farthest [or further, furthest]> [fɑ:ʳ, Am fɑ:r] ADJ
2. far (more distant):
 
 
 
 I. how [haʊ] ADV
1. how (in what way):
2. how (asking about condition):
3. how (exclamation):
II. how [haʊ] N
I. old <-er, -est> [oʊld] ADJ
1. old (not young, new):
2. old (denoting an age):
I. much <more, most> [mʌtʃ] ADJ
II. much <more, most> [mʌtʃ] ADV
III. much <more, most> [mʌtʃ] PRON
I. many <more, most> [ˈmen·i] ADJ
Phrases:
II. many <more, most> [ˈmen·i] PRON
I. long1 [lɔŋ] ADJ
Phrases:
II. long1 [lɔŋ] ADV
1. long (a long time):
2. long (for the whole duration):
I. far <farther, farthest [or further, furthest]> [far] ADV
1. far (a long distance):
2. far (distant in time):
3. far (in progress, degree):
4. far (much):
5. far (connecting adverbial phrase):
II. far <farther, farthest [or further, furthest]> [far] ADJ
2. far (more distant):
-  to investigate how/whether/why ...
 -  
 
 
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