He sat in the front row, his mouth half open.他坐在前排，嘴半开着。这里应该是his mouth half is open，还是his mouth is half open，half是副词？The people, their livelihood secure, now have the leisure to take up sports.their livelihood secure独立主格可以放句中？
...rnment, higher education, non-profit and corporate—varied from around 4% to 25%; in most European nations, it is about 15%.请问老师as介词短语如何理解？作为所有研发资金的比例的国家支出从4%到25%不等？感觉好别扭啊。
Asked
to participate in a debate on the subject hosted by The Economist, and told
that the audience would vote, she pointedly joked: “Next let’s do ‘Is 2+2
exactly 4?’” But take part she did, in her always lively fashion.已经有did强调了，再倒装这种强调方式，可以模仿么...
There stood, facing the open window, a comfortable, roomy armchair.
Into this she sank, pressed down by a physical exhaustion that haunted her body
and seemed to reach into her soul. 老师，我不知道into this 做什么成分。想请问这是没有引起倒装的前置吗？
Tóibín, with a style as spare as Mann’s is ornate, brings a
measure of warmth to an outwardly chilly figure. 请教下大家这句话with a style as spare as
Mann’s is ornate, 这部分怎么理解？这里是指Toibin和Mann的风格都是spare吗？那ornate是干嘛的
...ng sign of mobility is the fact that by the
third millennium B.C., most pastoralists in this huge region spoke related
languages ancestral to the modem
Indo-European languages.
这是新概念3里的一句：
The village seemed deserted, the only sign of life being an ugly-looking black goat tied to a tree on a short length of rope in a field nearby.
这里面的 on 是什么意思？是表示“依附”“固定在……上”？