Past Tense of sustain: Conjugations in Past and Present Participles

What is the past tense of “sustain?” Most commonly, the past tense of the word “sustain” is “sustained.” Although the word form will change based on its participle. And the sentence where it’s used. For example, referencing “sustain” in the present participle form will change it to “sustaining,” but in the infinitive form, will be “sustain.”

What is the past tense of the word "sustain"

The past tense (past participle) form of “sustain” is “sustained.” The infinitive of the word form is “sustain.” The present participle form is “sustaining.” The past tense form is “sustained” and past participle form is “sustained.”

Understanding verb tenses

The general grammar rules that govern past tenses are as follows. The simple past tense form is created by adding a -ed or -d affix to the root word of the verb. Some verbs use a -t variation where they end in a -t. For example, when "dream" turns into "dreamt."

The past perfect tense is formed for regular verbs (ending in -ed, -d, or -t) by adding "had" followed by the verb. For example, "I had finished."

The past continuous tense is formed by the verb "be" followed by the affix or ending of -ing. For example, "we were having dinner."

Lastly, the past perfect continuous tense is formed by adding "had been" followed by the affix or ending of -ing. For example, "I had been building a castle with my sister."

For more information on forming all past tenses, visit our "understanding verb tenses" resource.

Sentence examples for the past tense of the word "sustain"

• Infinitive: I sustain.
• Present participle: She is sustaining.
• Past tense: I sustained.
• Past particle: I have sustained.

Verb forms of the word "sustain"

Example sentences in all verb forms:

Indefinite present tense

I sustain.

Present continuous tense

She/he/it is sustaining.

Present perfect continuous tense

She/he/it has/had sustained.

Present perfect tense

She/he/it has/had been sustaining.

Simple past tense

She/he/it sustained.

Past continuous tense

She/he/it were sustaining.

Past perfect tense

She/he/it has/had been sustaining.

Perfect continuous tense

She/he/it will/shall sustain.

Simple future tense

She/he/it will/shall be sustaining.

Future perfect tense

She/he/it will/shall have sustained.

Future perfect continuous tense

She/he/it will/shall have been sustaining.

Sentence examples in all forms

Sentence examples in all participles and parts of speech:

Verb Tense	Example sentence
Simple Present Tense	I sustain
Present Continuous Tense	She/he/it sustaining
Present Perfect Tense	She/he/it has/had been sustaining
Simple Past Tense	She/he/it sustained
Past Continuous Tense	She/he/it were sustaining
Past Perfect Tense	I had sustained.
Past Perfect Continuous Tense	She/he/it has/had been sustaining
Simple Future Tense	She/he/it will/shall be sustaining
Future Continuous Tense	I will be sustaining.
Future Perfect Tense	She/he/it will/shall have sustained
Future Perfect Continuous Tense	She/he/it will/shall have been sustaining