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 They cleaned the window.
(simple past tense)

In the Present Tense:

 I clean the window.
(simple present tense)

 They clean the window.
(simple present tense)

In the Future Tense:

 I will clean the window.
(simple future tense)

 They will clean the window.
(simple future tense)

Forming Verbs in the Simple Tenses
Here is an overview on how to form the simple tenses:

Forming the Simple Past Tense (for most verbs)

[base form of the verb]

+

"ed"

 They jumped.
This is how the simple past tense is formed with most verbs. However, there are several spelling
rules to consider.

Read more about forming the simple past tense.

Forming the Simple Present Tense (for most verbs)

[base form of the verb by itself]