词作主语 主语应该加ing变名词 判断句底词作主语词能作主语首先解句结构通主语加谓语构句或者说句主语谓语结构谓语带宾语或者复合宾语主语由几词短语或句组谓语几并列判断呢结构:简单V-ing +谓语:Walking is useful.复杂点:Walking and running every day do good to your health.(两V-ing作主语)管V-ing形式面要跟谓语V-ing +...,(注意逗号)主语+谓语+……结构V-ing主语状语主语能用逗号与谓语隔Walking and running every day, you will find you will be healthy..