谁能帮我分析一下这句话时态句型等等.BBC NEWS 4月30期里面有这样一句.America is promising further sanctions in the coming days should Russia fail to make good on its Geneva commitments.这句话的意思我能看懂,只是最

来源：学生作业帮助网编辑：作业帮时间：2024/05/16 16:00:16

你所给的句子可以作以变形来理解——
If Russia should fail to make good on its Geneva commitments,America is promising further sanctions in the coming days .
原来给的整体句子实际就是【省略了If的虚拟条件句】;
is promising是【现在进行时,表示将来】.
另外,主句谓语动词 is promising 之所以这样用,是因为【承诺】这个动作在发此消息的阶段正在进行,即【目前或现阶段美国正在让人知晓其做出的承诺】.
祝你开心如意!

1 is promising further sanctions
== promises that further sanctions are to be exercised / exerted

2 should Russia fail - - - -
== if Russia fails - - - -

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