know which side of one's bread is buttered

knows which side of one's bread is buttered 三单 knowing which side of one's bread is buttered 现在分词 knew which side of one's bread was buttered 过去式 knew which side of one's bread is buttered 过去式 known which side of one's bread was buttered 过去式 known which side of one's bread was buttered 过去分词 known which side of one's bread is buttered 过去式 known which side of one's bread is buttered 过去分词