Dopo aver studiati tutti i verbi, riassumiamo nella tabella sottostante gli ausiliari che servono a formare sia alcuni modi verbali (futuro e condizionale) nonché per trasformare le frasi da affermative in negative o interrogative o interr./negative. Come si vede vi è una certa regolarità di strutture sintattiche che valgono anche per i verbi modali.
Tabella 10.10. VERBI AUSILIARI E LORO USO
| AFFERMATIVE | NEGATIVE | INTERROGATIVE | INTERROGATIVO-NEGATIVE |
|---|---|---|---|
| I am | I am not | am I? | am I not |
| I have | I have not (haven't) | have I? | have I not (haven't I?) |
| I work | I do not (don't) work | do I work? | don't I work? |
| He works | he does not (doesn't) work | does he work? | doesn't he work? |
| I shall (I'll) work | I shall not (shan't) work | shall I work? | shan't I work? |
| She will (she'll) work | she will not (won't) work | will she work? | won't she work? |
| I should (I'd) work | I should not (shouldn't) work | should I work? | shouldn't I work? |
| They would (they'd) work | they would not (wouldn't) work | would they work? | wouldn't they work? |
| I can | I can not (cannot can't) | can I? | can I not (can't I?) |
| I could | I could not (couldn't) | could I? | could I not (couldn't I?) |