(Picture: Marking of tense, mood, number and person in Old English Source: Lass 1999: 159)
In Old English, there occur three moods (indicative, subjunctive and imperative) in the present tense and two moods in the past tense.
Although there are three moods in the present tense, only the indicative, apart from the subjunctive plural, is marked by distinct endings: singular -e, -st, -ež and plural -až. The subjunctive and imperative singular have the same ending as 1st person singular indicative and also the imperative plural is identical with its indicative correspondant. Only the subjunctive plural has a different marking: -en. Subjunctive and imperative are just recognisable via meaning.
In the past tense, only four endings are distinct: 1st and 3rd person indicative singular are marked with -d-e, 2nd person singular with -d-st and the plural is marked with the ending -d-on.The imperative does not exist at all and also the subjunctive is reduced to the plural which is marked with -d-en.