S: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 
She is suffering from a headache.
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| Past Participle: suffered | Gerund: suffering |
[I] I suffer |
[you, we, they] You suffer |
[he, she, it] He suffers |
[I] I suffered |
[you, we, they] You suffered |
[he, she, it] He suffered |
[I] I will suffer |
[you, we, they] You will suffer |
[he, she, it] He will suffer |
[I] I am suffering |
[you, we, they] You are suffering |
[he, she, it] He is suffering |
[I] I was suffering |
[you, we, they] You were suffering |
[he, she, it] He was suffering |
[I] I have suffered |
[you, we, they] You have suffered |
[he, she, it] He has suffered |
[I] I had suffered |
[you, we, they] You had suffered |
[he, she, it] He had suffered |
[I] I will have suffered |
[you, we, they] You will have suffered |
[he, she, it] He will have suffered |
[I] I do suffer |
[you, we, they] You do suffer |
[he, she, it] He does suffer |
[I] I did suffer |
[you, we, they] You did suffer |
[he, she, it] He did suffer |