Present participle; Past participle - suffocating - suffocated Present - suffocate - suffocate - suffocates - suffocate - suffocate - suffocate Past - suffocated - suffocated - suffocated - suffocated - suffocated - suffocated Future - will suffocate - will suffocate - will suffocate - will suffocate - will suffocate - will suffocate Present conditional - would suffocate - would suffocate - would suffocate - would suffocate - would suffocate - would suffocate Present Perfect - have suffocated - have suffocated - has suffocated - have suffocated - have suffocated - have suffocated Past Perfect - had suffocated - had suffocated - had suffocated - had suffocated - had suffocated - had suffocated Future Perfect - will have suffocated - will have suffocated - will have suffocated - will have suffocated - will have suffocated - will have suffocated Past conditional - would have suffocated - would have suffocated - would have suffocated - would have suffocated - would have suffocated - would have suffocated Imperative - - - suffocate - - - - - - - -