| Play | Key Line | Modern Text | Original Text |
| Henry VI Part 1 | 1H6 I.i.99 | Bedford, if thou be slack, I'll fight it out. | Bedford, if thou be slacke, Ile fight it out. |
| Henry VI Part 2 | 2H6 I.ii.66 | And, being a woman, I will not be slack | And being a woman, I will not be slacke |
| King Edward III | E3 III.iii.88 | Bethink thyself how slack I was at sea, | Bethinke thy selfe howe slacke I was at sea. |
| King Lear | KL I.iii.10 | If you come slack of former services | If you come slacke of former seruices, |
| King Lear | KL II.iv.240 | Why not, my lord? If then they chanced to slack ye, | Why not my Lord? / If then they chanc'd to slacke ye, |
| The Merry Wives of Windsor | MW III.iv.108 | I to slack it! | I to slacke it. |
| Othello | Oth IV.iii.86 | If wives do fall. Say that they slack their duties, | If Wiues do fall: (Say, that they slacke their duties, |
| Pericles | Per III.i.43 | Slack the bolins there! – Thou wilt not, | Slake the bolins there; thou wilt not |
| Pericles | Per IV.ii.60 | Alack that Leonine was so slack, so slow! | Alacke that Leonine was so slacke, so slow, |
| Richard III | R3 I.iv.278 | By heavens, the Duke shall know how slack you have been. | By Heauen the Duke shall know how slacke you haue beene. |
| Romeo and Juliet | RJ IV.i.3 | And I am nothing slow to slack his haste. | And I am nothing slow to slack his hast. |
| The Taming of the Shrew | TS I.ii.272 | Sir, I shall not be slack. In sign whereof, | Sir, I shal not be slacke, in signe whereof, |
| Troilus and Cressida | TC III.iii.24 | That their negotiations all must slack, | That their negotiations all must slacke, |